Can't Add Script in Unity? It's Not the File Name (5 Real Causes)

"Can't add script", "the script class cannot be found" or "needs to derive from MonoBehaviour"? Shown with the real Unity 6.5 dialogs: a file name / class name mismatch no longer blocks a script (we tested it, even a two-class file was accepted), so here are the causes that actually do: a compile error in a DIFFERENT script, a class that isn't a MonoBehaviour, abstract and generic classes, and scripts inside an Editor folder or editor-only assembly definition. Full guide (every error message, renaming safely, FAQ): https://devforgeunity.com/unity-cant-... More Unity tutorials: https://devforgeunity.com Chapters: 0:00 Intro 0:30 The file name myth 1:16 Compile errors 1:57 Not a MonoBehaviour 2:25 Abstract and generic 3:01 Editor folders 3:18 Recap #unity #gamedev #unitytutorial #csharp #indiedev