error compiling main mod files

Hello, I tried several times to export my mod but it gives me the following message:

One or more main mod files were not compiled correctly
this is usually caused by inconsistencies in the mod code during builds.
Mcreator can solve this problem by regenerating all mod code.
If you have locked mod items or mod core files, they can also cause this error
Click the Regenerate Code button to proceed with this action

And when I click on Regenerate the code it always gives me the same error.

Thank you in advance for your help..