Can't add script component because the script class cannot be found?

Question

Yesterday I updated unity from unity5 to 2018.2.2f1. Unity scripts are not loading after Update 2018.2.2f1.

Once I try to play the Scene the scripts are not loaded a

Answer 1

One more thing which might help apart from other answers

• Make the class which inherits from the MonoBehaviour the first class in the file. It fixed this issue for me.