How to remove errors in MonoDevelop ?

Hello,

I created a script GameEngine.cs in Plugins folder to be sure that My Script is compiled before others.
In My Script I’ve a public static boolean IsPaused that I set to false at gamestart.
I’ve a button pause with a script Pause.cs where I set the value GameEngine.IsPaused to true.
When I compile and run, everything is ok and work as I want.
But if I look the script in MonoDevelop, it points me that GameEngine doesn’t exist in the current context.
Do I have to put all my script in the same folder to avoid this error in MonoDevelop ?
Cause my scripts are working fine.

Click “Assets → Sync MonoDevelop project”