All complier errors have to be fixed before you can enter playmode!

i'm trying to hit the play button but immediately it says this-------

All compiler errors have to be fixed before you can enter playmode! UnityEditor.SceneView:ShowCompileErrorNotification()

please help

Open the Console (Windows->Console) and double-click every one of these lines with a red mark in fron of them. This brings up your code-editor. Fix all errors in your scripts, and try again. :)

Two days ago: http://answers.unity3d.com/questions/26835/how-do-i-fix-all-compiler-errors-so-i-can-enter-playmode

Please do try searching.

i am double clicking on the error but nothing happens?

i think this error would tell you more.
Internal compiler error. See the console log for more information. output was:
Unhandled Exception: System.TypeLoadException: Could not load type ‘System.Func`1’ from assembly ‘mscorlib, Version=2.0.5.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e’

I just reimport all assets and it work fine.

When I reboot the Unity, everything is fine.

@Rithy-Jim @xirtam_cn have done all these and yet it gives me same reply, please help