Reply To: Have 500 error (Internal server error) on shop page

I found what the problem is, but, unfortunately, I don’t know how to fix it for now.
It’s in permanent links. The error disappears if I put a permanent link in the following form: http: //site.com/? p = 123
It seems to me that the system can not find “product categories”, as if they need to be recreated somewhere … (these are just guesses)
Perhaps you can tell what the problem is? plugins checked (and with them and without them, the problem remains).