Could you post your full script please Connor, the above looks like it has some code missing.
Incidentally, your post looks the same as the one your posted the other day, which got a reply and a solution. Is this the same problem? e.g. your class name “helloworld” does not match your filename “helloworld.cs”?
There is an item on the Unity Issue Tracker site at the moment which mentions the “TMP_CoroutineTween” text, e.g. the Unity is reporting the wrong filename in the error, but your issue looks to be the same as your previous post?
See also;
- Your other topic : The script needs to derive from MonoBehaviour!
- Unity - Issue Tracker : Attaching a script with a mismatching class/filename shows wrong name in popup/dialog