Hello Guys!
i`m new to Xamarin and I tryed to implement the Tutorial Class about the Custom Entrys from the Xamarin Site.
But when I try to start my project i get this Exception. I really have no clue and would hope that some of you could help me 
15 18:31:39.562 F/art ( 3511): art/runtime/runtime.cc:422] (no managed stack frames) 12-15 18:31:39.562 F/art ( 3511): art/runtime/runtime.cc:422] Pending exception android.runtime.JavaProxyThrowable: System.Reflection.TargetInvocationException: Exception has been thrown by the target of an invocation. ---> Java.Lang.ClassNotFoundException: Didn't find class "md5d17bd35609780d199e43dde5adecc1c9.MyEntryRenderer" on path: DexPathList[[zip file "/data/app/com.companyname.projectApp-1/base.apk"],nativeLibraryDirectories=[/data/app/com.companyname.projectApp-1/lib/x86, /system/fake-libs, /data/app/com.companyname.projectApp-1/base.apk!/lib/x86, /system/lib, /vendor/lib]] 12-15 18:31:39.562 F/art ( 3511): art/runtime/runtime.cc:422] at Java.Interop.JniEnvironment+Types.FindClass (System.String classname) [0x00114] in <438784097c4b4b56a7da6ca9301bc3c6>:0 12-15 18:31:39.562 F/art ( 3511): art/runtime/runtime.cc:422] at Java.Interop.JniType..ctor (System.String classname) [0x00006] in <438784097c4b4b56a7da6ca9301bc3c6>:0 12-15 18:31:39.562 F/art ( 3511): art/runtime/runtime.cc:422] at Java.Interop.JniPeerMembers+JniInstanceMethods..ctor (System.Type declaringType) [0x00064] in <438784097c4b4b56a7da6ca9301bc3c6>:0 12-15 18:31:39.562 F/art ( 3511): art/runtime/runtime.cc:422] at Java.Interop.JniPeerMembers+JniInstanceMethods.GetConstructorsForType (System.Type declaringType) [0x0002c] in <438784097c4b4b56a7da6ca9301bc3c6>:0 12-15 18:31:39.562 F/art ( 3511): art/runtime/runtime.cc:422] at Java.Interop.JniPeerMembers+JniInstanceMethods.StartCreateInstance (System.String constructorSignature, System.Type declaringType, Java.Interop.JniArgumentValue* parameters) [0x00032] in <438784097c4b4b56a7da6ca9301bc3c6>:0 12-15 18:31:39.562 F/art ( 3511): art/runtime/runtime.cc:422] at Xamarin.Forms.Platform.Android.FormsViewGroup..ctor (Android.Content.Context p0) [0x00046] in D:\agent\_work\1\s\Xamarin.Forms.Platform.Android.FormsViewGroup\obj\Release\generated\src\Xamarin.Forms.Platform.Android.FormsViewGroup.cs:89 12-15 18:31:39.562 F/art ( 3511): art/runtime/runtime.cc:422] at Xamarin.Forms.Platform.Android.VisualElementRenderer1[TElement]..ctor (Android.Content.Context context) [0x00012] in 
\agent_work\1\s\Xamarin.Forms.Platform.Android\VisualElementRenderer.cs:30
12-15 18:31:39.562 F/art ( 3511): art/runtime/runtime.cc:422] at Xamarin.Forms.Platform.Android.ViewRenderer2[TView,TNativeView]..ctor (Android.Content.Context context) [0x00000] in D:\agent\_work\1\s\Xamarin.Forms.Platform.Android\ViewRenderer.cs:25 12-15 18:31:39.562 F/art ( 3511): art/runtime/runtime.cc:422] at Xamarin.Forms.Platform.Android.EntryRenderer..ctor (Android.Content.Context context) [0x00000] in D:\agent\_work\1\s\Xamarin.Forms.Platform.Android\Renderers\EntryRenderer.cs:23 12-15 18:31:39.562 F/art ( 3511): art/runtime/runtime.cc:422] at projectApp.Android.MyEntryRenderer.get_JniPeerMembers () [0x00000] in D:\App\Backups\projectApp\projectApp\projectApp.Android\MyEntryRenderer.cs:17 12-15 18:31:39.562 F/art ( 3511): art/runtime/runtime.cc:422] at (wrapper managed-to-native) System.Reflection.MonoCMethod:InternalInvoke (System.Reflection.MonoCMethod,object,object[],System.Exception&) 12-15 18:31:39.562 F/art ( 3511): art/runtime/runtime.cc:422] at System.Reflection.MonoCMethod.InternalInvoke (System.Object obj, System.Object[] parameters) [0x00002] in <657aa8fea4454dc898a9e5f379c58734>:0 12-15 18:31:39.562 F/art ( 3511): art/runtime/runtime.cc:422] --- End of inner exception stack trace --- 12-15 18:31:39.562 F/art ( 3511): art/runtime/runtime.cc:422] at System.Reflection.MonoCMethod.InternalInvoke (System.Object obj, System.Object[] parameters) [0x00017] in <657aa8fea4454dc898a9e5f379c58734>:0 12-15 18:31:39.562 F/art ( 3511): art/runtime/runtime.cc:422] at System.Reflection.MonoCMethod.DoInvoke (System.Object obj, System.Reflection.BindingFlags invokeAttr, System.Reflection.Binder binder, System.Object[] parameters, System.Globalization.CultureInfo culture) [0x0007a] in <657aa8fea4454dc898a9e5f379c58734>:0 12-15 18:31:39.562 F/art ( 3511): art/runtime/runtime.cc:422] at System.Reflection.MonoCMethod.Invoke (System.Reflection.BindingFlags invokeAttr, System.Reflection.Binder binder, System.Object[] parameters, System.Globalization.CultureInfo culture) [0x00000] in <657aa8fea4454dc898a9e5f379c58734>:0 12-15 18:31:39.562 F/art ( 3511): art/runtime/runtime.cc:422] at System.RuntimeType.CreateInstanceImpl (System.Reflection.BindingFlags bindingAttr, System.Reflection.Binder binder, System.Object[] args, System.Globalization.CultureInfo culture, System.Object[] activationAttributes, System.Threading.StackCrawlMark& stackMark) [0x00213] in <657aa8fea4454dc898a9e5f379c58734>:0 12-15 18:31:39.562 F/art ( 3511): art/runtime/runtime.cc:422] at System.Activator.CreateInstance (System.Type type, System.Reflection.BindingFlags bindingAttr, System.Reflection.Binder binder, System.Object[] args, System.Globalization.CultureInfo culture, System.Object[] activationAttributes) [0x000a1] in <657aa8fea4454dc898a9e5f379c58734>:0 12-15 18:31:39.562 F/art ( 3511): art/runtime/runtime.cc:422] at System.Activator.CreateInstance (System.Type type, System.Object[] args) [0x00000] in <657aa8fea4454dc898a9e5f379c58734>:0 12-15 18:31:39.562 F/art ( 3511): art/runtime/runtime.cc:422] at Xamarin.Forms.Internals.Registrar1[TRegistrable].GetHandler (System.Type type, System.Object[] args) [0x00051] in \agent_work\1\s\Xamarin.Forms.Core\Registrar.cs:56
12-15 18:31:39.562 F/art ( 3511): art/runtime/runtime.cc:422] at Xamarin.Forms.Internals.Registrar1[TRegistrable].GetHandler[TOut] (System.Type type, System.Object[] args) [0x00000] in D:\agent\_work\1\s\Xamarin.Forms.Core\Registrar.cs:70 12-15 18:31:39.562 F/art ( 3511): art/runtime/runtime.cc:422] at Xamarin.Forms.Platform.Android.Platform.CreateRenderer (Xamarin.Forms.VisualElement element, Android.Content.Context context) [0x00000] in D:\agent\_work\1\s\Xamarin.Forms.Platform.Android\Platform.cs:312 12-15 18:31:39.562 F/art ( 3511): art/runtime/runtime.cc:422] at Xamarin.Forms.Platform.Android.VisualElementPackager.AddChild (Xamarin.Forms.VisualElement view, Xamarin.Forms.Platform.Android.IVisualElementRenderer oldRenderer, Xamarin.Forms.Platform.Android.RendererPool pool, System.Boolean sameChildren) [0x00044] in D:\agent\_work\1\s\Xamarin.Forms.Platform.Android\VisualElementPackager.cs:97 12-15 18:31:39.562 F/art ( 3511): art/runtime/runtime.cc:422] at Xamarin.Forms.Platform.Android.VisualElementPackager.SetElement (Xamarin.Forms.VisualElement oldElement, Xamarin.Forms.VisualElement newElement) [0x00104] in D:\agent\_work\1\s\Xamarin.Forms.Platform.Android\VisualElementPackager.cs:231 12-15 18:31:39.562 F/art ( 3511): art/runtime/runtime.cc:422] at Xamarin.Forms.Platform.Android.VisualElementPackager.Load () [0x00000] in D:\agent\_work\1\s\Xamarin.Forms.Platform.Android\VisualElementPackager.cs:76 12-15 18:31:39.562 F/art ( 3511): art/runtime/runtime.cc:422] at Xamarin.Forms.Platform.Android.VisualElementRenderer1[TElement].SetPackager (Xamarin.Forms.Platform.Android.VisualElementPackager packager) [0x00007] in \agent_work\1\s\Xamarin.Forms.Platform.Android\VisualElementRenderer.cs:385
12-15 18:31:39.562 F/art ( 3511): art/runtime/runtime.cc:422] at Xamarin.Forms.Platform.Android.VisualElementRenderer1[TElement].SetElement (TElement element) [0x000ce] in D:\agent\_work\1\s\Xamarin.Forms.Platform.Android\VisualElementRenderer.cs:179 12-15 18:31:39.562 F/art ( 3511): art/runtime/runtime.cc:422] at Xamarin.Forms.Platform.Android.VisualElementRenderer1[TElement].Xamarin.Forms.Platform.Android.IVisualElementRenderer.SetElement (Xamarin.Forms.VisualElement element) [0x00027] in \agent_work\1\s\Xamarin.Forms.Platform.Android\VisualElementRenderer.cs:125
12-15 18:31:39.562 F/art ( 3511): art/runtime/runtime.cc:422] at Xamarin.Forms.Platform.Android.Platform.CreateRenderer (Xamarin.Forms.VisualElement element, Android.Content.Context context) [0x00024] in \agent_work\1\s\Xamarin.Forms.Platform.Android\Platform.cs:314
12-15 18:31:39.562 F/art ( 3511): art/runtime/runtime.cc:422] at Xamarin.Forms.Platform.Android.VisualElementPackager.AddChild (Xamarin.Forms.VisualElement view, Xamarin.Forms.Platform.Android.IVisualElementRenderer oldRenderer, Xamarin.Forms.Platform.Android.RendererPool pool, System.Boolean sameChildren) [0x00044] in \agent_work\1\s\Xamarin.Forms.Platform.Android\VisualElementPackager.cs:97
12-15 18:31:39.562 F/art ( 3511): art/runtime/runtime.cc:422] at Xamarin.Forms.Platform.Android.VisualElementPackager.SetElement (Xamarin.Forms.VisualElement oldElement, Xamarin.Forms.VisualElement newElement) [0x00104] in \agent_work\1\s\Xamarin.Forms.Platform.Android\VisualElementPackager.cs:231
12-15 18:31:39.562 F/art ( 3511): art/runtime/runtime.cc:422] at Xamarin.Forms.Platform.Android.VisualElementPackager.Load () [0x00000] in \agent_work\1\s\Xamarin.Forms.Platform.Android\VisualElementPackager.cs:76
12-15 18:31:39.562 F/art ( 3511): art/runtime/runtime.cc:422] at Xamarin.Forms.Platform.Android.VisualElementRenderer1[TElement].SetPackager (Xamarin.Forms.Platform.Android.VisualElementPackager packager) [0x00007] in D:\agent\_work\1\s\Xamarin.Forms.Platform.Android\VisualElementRenderer.cs:385 12-15 18:31:39.562 F/art ( 3511): art/runtime/runtime.cc:422] at Xamarin.Forms.Platform.Android.VisualElementRenderer1[TElement].SetElement (TElement element) [0x000ce] in \agent_work\1\s\Xamarin.Forms.Platform.Android\VisualElementRenderer.cs:179
12-15 18:31:39.562 F/art ( 3511): art/runtime/runtime.cc:422] at Xamarin.Forms.Platform.Android.VisualElementRenderer1[TElement].Xamarin.Forms.Platform.Android.IVisualElementRenderer.SetElement (Xamarin.Forms.VisualElement element) [0x00027] in D:\agent\_work\1\s\Xamarin.Forms.Platform.Android\VisualElementRenderer.cs:125 12-15 18:31:39.562 F/art ( 3511): art/runtime/runtime.cc:422] at Xamarin.Forms.Platform.Android.Platform.CreateRenderer (Xamarin.Forms.VisualElement element, Android.Content.Context context) [0x00024] in D:\agent\_work\1\s\Xamarin.Forms.Platform.Android\Platform.cs:314 12-15 18:31:39.562 F/art ( 3511): art/runtime/runtime.cc:422] at Xamarin.Forms.Platform.Android.VisualElementPackager.AddChild (Xamarin.Forms.VisualElement view, Xamarin.Forms.Platform.Android.IVisualElementRenderer oldRenderer, Xamarin.Forms.Platform.Android.RendererPool pool, System.Boolean sameChildren) [0x00044] in D:\agent\_work\1\s\Xamarin.Forms.Platform.Android\VisualElementPackager.cs:97 12-15 18:31:39.562 F/art ( 3511): art/runtime/runtime.cc:422] at Xamarin.Forms.Platform.Android.VisualElementPackager.SetElement (Xamarin.Forms.VisualElement oldElement, Xamarin.Forms.VisualElement newElement) [0x00104] in D:\agent\_work\1\s\Xamarin.Forms.Platform.Android\VisualElementPackager.cs:231 12-15 18:31:39.562 F/art ( 3511): art/runtime/runtime.cc:422] at Xamarin.Forms.Platform.Android.VisualElementPackager.Load () [0x00000] in D:\agent\_work\1\s\Xamarin.Forms.Platform.Android\VisualElementPackager.cs:76 12-15 18:31:39.562 F/art ( 3511): art/runtime/runtime.cc:422] at Xamarin.Forms.Platform.Android.VisualElementRenderer1[TElement].SetPackager (Xamarin.Forms.Platform.Android.VisualElementPackager packager) [0x00007] in \agent_work\1\s\Xamarin.Forms.Platform.Android\VisualElementRenderer.cs:385
12-15 18:31:39.562 F/art ( 3511): art/runtime/runtime.cc:422] at Xamarin.Forms.Platform.Android.VisualElementRenderer1[TElement].SetElement (TElement element) [0x000ce] in D:\agent\_work\1\s\Xamarin.Forms.Platform.Android\VisualElementRenderer.cs:179 12-15 18:31:39.562 F/art ( 3511): art/runtime/runtime.cc:422] at Xamarin.Forms.Platform.Android.VisualElementRenderer1[TElement].Xamarin.Forms.Platform.Android.IVisualElementRenderer.SetElement (Xamarin.Forms.VisualElement element) [0x00027] in \agent_work\1\s\Xamarin.Forms.Platform.Android\VisualElementRenderer.cs:125
12-15 18:31:39.562 F/art ( 3511): art/runtime/runtime.cc:422] at Xamarin.Forms.Platform.Android.Platform.CreateRenderer (Xamarin.Forms.VisualElement element, Android.Support.V4.App.FragmentManager fragmentManager, Android.Content.Context context) [0x00036] in \agent_work\1\s\Xamarin.Forms.Platform.Android\Platform.cs:361
12-15 18:31:39.562 F/art ( 3511): art/runtime/runtime.cc:422] at Xamarin.Forms.Platform.Android.AppCompat.FragmentContainer.OnCreateView (Android.Views.LayoutInflater inflater, Android.Views.ViewGroup container, Android.OS.Bundle savedInstanceState) [0x00008] in \agent_work\1\s\Xamarin.Forms.Platform.Android\AppCompat\FragmentContainer.cs:67
12-15 18:31:39.562 F/art ( 3511): art/runtime/runtime.cc:422] at Android.Support.V4.App.Fragment.n_OnCreateView_Landroid_view_LayoutInflater_Landroid_view_ViewGroup_Landroid_os_Bundle_ (System.IntPtr jnienv, System.IntPtr native__this, System.IntPtr native_inflater, System.IntPtr native_container, System.IntPtr native_savedInstanceState) [0x00020] in <1e89c43d3c7d48b5ba69bfc0b1bdf114>:0
12-15 18:31:39.562 F/art ( 3511): art/runtime/runtime.cc:422] at (wrapper dynamic-method) System.Object:441936af-046b-4894-97f3-787db5d12640 (intptr,intptr,intptr,intptr,intptr)
12-15 18:31:39.562 F/art ( 3511): art/runtime/runtime.cc:422] at android.view.View md5270abb39e60627f0f200893b490a1ade.FragmentContainer.n_onCreateView(android.view.LayoutInflater, android.view.ViewGroup, android.os.Bundle) (FragmentContainer.java:-2)
12-15 18:31:39.562 F/art ( 3511): art/runtime/runtime.cc:422] at android.view.View md5270abb39e60627f0f200893b490a1ade.FragmentContainer.onCreateView(android.view.LayoutInflater, android.view.ViewGroup, android.os.Bundle) (FragmentContainer.java:51)
12-15 18:31:39.562 F/art ( 3511): art/runtime/runtime.cc:422] at android.view.View android.support.v4.app.Fragment.performCreateView(android.view.LayoutInflater, android.view.ViewGroup, android.os.Bundle) (Fragment.java:2248)
12-15 18:31:39.562 F/art ( 3511): art/runtime/runtime.cc:422] at void android.support.v4.app.FragmentManagerImpl.moveToState(android.support.v4.app.Fragment, int, int, int, boolean) (FragmentManager.java:1340)
12-15 18:31:39.562 F/art ( 3511): art/runtime/runtime.cc:422] at void android.support.v4.app.FragmentManagerImpl.moveFragmentToExpectedState(android.support.v4.app.Fragment) (FragmentManager.java:1569)
12-15 18:31:39.562 F/art ( 3511): art/runtime/runtime.cc:422] at void android.support.v4.app.FragmentManagerImpl.moveToState(int, boolean) (FragmentManager.java:1636)
12-15 18:31:39.562 F/art ( 3511): art/runtime/runtime.cc:422] at void android.support.v4.app.BackStackRecord.executeOps() (BackStackRecord.java:758)
12-15 18:31:39.562 F/art ( 3511): art/runtime/runtime.cc:422] at void android.support.v4.app.FragmentManagerImpl.executeOps(java.util.ArrayList, java.util.ArrayList, int, int) (FragmentManager.java:2415)
12-15 18:31:39.562 F/art ( 3511): art/runtime/runtime.cc:422] at void android.support.v4.app.FragmentManagerImpl.executeOpsTogether(java.util.ArrayList, java.util.ArrayList, int, int) (FragmentManager.java:2201)
12-15 18:31:39.562 F/art ( 3511): art/runtime/runtime.cc:422] at void android.support.v4.app.FragmentManagerImpl.optimizeAndExecuteOps(java.util.ArrayList, java.util.ArrayList) (FragmentManager.java:2155)
12-15 18:31:39.562 F/art ( 3511): art/runtime/runtime.cc:422] at boolean android.support.v4.app.FragmentManagerImpl.execPendingActions() (FragmentManager.java:2064)
12-15 18:31:39.562 F/art ( 3511): art/runtime/runtime.cc:422] at boolean android.support.v4.app.FragmentController.execPendingActions() (FragmentController.java:379)
12-15 18:31:39.562 F/art ( 3511): art/runtime/runtime.cc:422] at void android.support.v4.app.FragmentActivity.onStart() (FragmentActivity.java:607)
12-15 18:31:39.562 F/art ( 3511): art/runtime/runtime.cc:422] at void android.support.v7.app.AppCompatActivity.onStart() (AppCompatActivity.java:178)
12-15 18:31:39.562 F/art ( 3511): art/runtime/runtime.cc:422] at void md5b60ffeb829f638581ab2bb9b1a7f4f3f.FormsAppCompatActivity.n_onStart() (FormsAppCompatActivity.java:-2)
12-15 18:31:39.562 F/art ( 3511): art/runtime/runtime.cc:422] at void md5b60ffeb829f638581ab2bb9b1a7f4f3f.FormsAppCompatActivity.onStart() (FormsAppCompatActivity.java:120)
12-15 18:31:39.562 F/art ( 3511): art/runtime/runtime.cc:422] at void android.app.Instrumentation.callActivityOnStart(android.app.Activity) (Instrumentation.java:1248)
12-15 18:31:39.562 F/art ( 3511): art/runtime/runtime.cc:422] at void android.app.Activity.performStart() (Activity.java:6696)
12-15 18:31:39.562 F/art ( 3511): art/runtime/runtime.cc:422] at android.app.Activity android.app.ActivityThread.performLaunchActivity(android.app.ActivityThread$ActivityClientRecord, android.content.Intent) (ActivityThread.java:2628)
12-15 18:31:39.562 F/art ( 3511): art/runtime/runtime.cc:422] at void android.app.ActivityThread.handleLaunchActivity(android.app.ActivityThread$ActivityClientRecord, android.content.Intent, java.lang.String) (ActivityThread.java:2726)
12-15 18:31:39.562 F/art ( 3511): art/runtime/runtime.cc:422] at void android.app.ActivityThread.-wrap12(android.app.ActivityThread, android.app.ActivityThread$ActivityClientRecord, android.content.Intent, java.lang.String) (ActivityThread.java:-1)
12-15 18:31:39.562 F/art ( 3511): art/runtime/runtime.cc:422] at void android.app.ActivityThread$H.handleMessage(android.os.Message) (ActivityThread.java:1477)
12-15 18:31:39.562 F/art ( 3511): art/runtime/runtime.cc:422] at void android.os.Handler.dispatchMessage(android.os.Message) (Handler.java:102)
12-15 18:31:39.563 F/art ( 3511): art/runtime/runtime.cc:422] at void android.os.Looper.loop() (Looper.java:154)
12-15 18:31:39.563 F/art ( 3511): art/runtime/runtime.cc:422] at void android.app.ActivityThread.main(java.lang.String[]) (ActivityThread.java:6119)
12-15 18:31:39.563 F/art ( 3511): art/runtime/runtime.cc:422] at java.lang.Object java.lang.reflect.Method.invoke!(java.lang.Object, java.lang.Object[]) (Method.java:-2)
12-15 18:31:39.563 F/art ( 3511): art/runtime/runtime.cc:422] at void com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run() (ZygoteInit.java:886)
12-15 18:31:39.563 F/art ( 3511): art/runtime/runtime.cc:422] at void com.android.internal.os.ZygoteInit.main(java.lang.String[]) (ZygoteInit.java:776)
12-15 18:31:39.563 F/art ( 3511): art/runtime/runtime.cc:422] Dumping all threads without appropriate locks held: thread list lock mutator lock
12-15 18:31:39.563 F/art ( 3511): art/runtime/runtime.cc:422] All threads: