Gettings a "Unexpected Error" when using Group Manager

[MatthewStull1]

I am helping my staff with one of their Hub sites.  They didn't put in a group when they created it and now I am trying to go back and put in the group.  Unfortunately, the Groups Manager is giving me an "Unexpected Error".  Does anyone know how I can get around this without deleting the whole site and redoing it?  See the attached picture of my error when I click on the Groups Manager from the main Sites page.

[Anonymous User]

Can you work with support to get us access to your org? I don't immediately recognize this bug. 

[MatthewStull1]

Thanks, will do.

[MatthewStull1]

After working with tech support, we concluded that this site somehow got corrupted.  I had to delete it and create a new one.