“Waiting for device” when debugging on phone of android4.3 use visual studio

1>"D:\DataAnTingting\HVS.MobileEnterprise\MobileEnterprise\MobileEnterprise.Droid\MobileEnterprise.Droid.csproj" (SignAndroidPackage target) (1) -> 1>(_ResolveSatellitePaths target) -> 1> C:\Program Files (x86)\MSBuild\Xamarin\Android\Xamarin.Android.Common.targets(1228,3): warning MSB3247: Found conflicts between different versions of the same dependent assembly. [D:\DataAnTingting\HVS.MobileEnterprise\MobileEnterprise\MobileEnterprise.Droid\MobileEnterprise.Droid.csproj] 1> 1> 2 Warning(s) 1> 0 Error(s) 1> 1>Time Elapsed 00:00:09.04 1> 1> 1> 1>Waiting for device..