All scripts are broken after project upgrade

I upgraded one of my projects from 2017.2.0f3 to 2018.4.19f1 LTS (which was released today), and now, all my scripts don't work. I get a message saying "No MonoBehaivor scripts in this file, or their names do not match the file name" when I open them in the inspector. I do have MonoBehaivor a script in the file, and its name is the same as the file name (

public class FileName : MonoBehaivor { (...) }

).

All the scripts worked fine in 2017.2, is there anything I can do to fix this?

 

Try deleting your csproj files and I think the sln file. It should rebuild those when you open the project again. If that doesn't work, delete the library.

Also have a backup or a version control system in place before doing big upgrades or deleting stuff. (if you don't already)

 

You misspelled MonoBehaviour
https://docs.unity3d.com/ScriptReference/MonoBehaviour.html

Also, please use Code Tags, rather than quote for pasting code.

 

I tried deleting both of them and letting it rebuild and the issue still happens.

I made sure to backup everything except the Library folder before upgrading, if I can't find a solution I'll restore the backup and try upgrading to a different version (like 2019.2).

Guess that's what I get for not copying and pasting the code . I checked the scripts and MonoBehaviour is spelled correctly.

 

I restored my backup and then upgraded it to the latest version of Unity (2019.3.5f1) instead and the scripts are still broken. Any other ideas?

 

Make sure you have resolved all compile errors before dealing with the no MonoBehaviour in script file issues. Unity doesn't know that there is a MonoBehaviour class in the script file until it can get a compile successfully completed, of everything.

 

I found a few errors in the Standard Assets (from obsolete script calls) and fixed them. Now it works!

 

what do you mean by that? the same thing happened to me and I dont understand what you are talking about. (sorry, im new to unity)

 

I did not upgrade unity, I was downloading a unity asset but then it froze permanently and I was forced to quit unity. when I relaunched it nothing changed except all of my scripts show the same error message that CovalenceSTU had.
All of the code in the scripts are still there and everything in the scripts should work perfectly fine, but all they show in the inspector is a script component named (Script) and a warning in it in place of where the scripts should be.

 

Hey everyone,
I also had the same problem (I upgraded from 2019 to 2021) , I removed standard assets and their dependencies, and that fixed the issue