Fatal Error in gc: Calling from unknown thread VS 2010

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Mobile

Android

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Hi everyone,
I have successfully written my Android Application using C# with Xamarin.Android Visual Studio 2010. I debugged and deploy my app to AVD Emulator to test and everything went fine. But now, i am ready to package my app, i want to build my app in "Release" mode, now i got the error that says "Fatal Error in gc: Calling from unknown thread". If i changed my build configuration back to "Debug" the build will be successful with 0 Error and 0 Warnings, but if i changed the build configuration to "Release", i will get the above error and the build will fail.

Please help me because i don't know what to do. I have up to 5 threads inside my code which i created using the System.Threading namespace, all my project consists of 5 activities, 1 class and 4 layout. The 1 class file in my project contains all the functions i created which i am calling those functions from the 5 activities simultaneously.

Please help me!