i got this error while testing my app in "System.NotSupportedException: Cannot compile: Parameter"

i got this error while testing my app in emulator "System.NotSupportedException: Cannot compile: Parameter"

"E/mono ( 1442): Unhandled Exception:
04-20 17:36:23.739 E/mono ( 1442): System.NotSupportedException: Cannot compile: Parameter
04-20 17:36:23.739 E/mono-rt ( 1442): [ERROR] FATAL UNHANDLED EXCEPTION: System.NotSupportedException: Cannot compile: Parameter
In mgmain JNI_OnLoad
InspectorDebugSession(0): Disposed
InspectorDebugSession(0): HandleTargetEvent: TargetExited"

i made xamarin.forms portable class library (pcl) app which contain two database tables they can store the data and retrieve by the request.
while trying save the data in the data base i got this error