Thread:Extension talk:Maps/Creating maps layers table ... Database.php: Could not open file./reply (3)

If everything is working fine, I suggest you ignore the error. You do not need this table unless you are using the layers functionality. Sadly enough I do not have the time to fix this, and I doubt the person that wrote this code is going to put in more effort either.

I have however created a bug to keep track of the issue. https://github.com/JeroenDeDauw/Maps/issues/30