Bug Error when trying to upload to itch.io please help

Hi my class is trying to upload our project WebGL version and it worked fine last week. Now we are getting this error message and have no idea how to resolve it. We tried uploaded from different computers and even uploaded the old version and not it gives the error as well. The version last week worked perfectly and now it wont

 

First thing I would try is disable compression as the message says. You'll find that in the Build Settings.

You could also try uploading to Unity Play by using the Web Publisher package just to see whether it's a specific issue with itch.io.