HI, This is not the same problem as a similarly named thread. :) I am working with an old version of a DLC I made a year or two ago, to fix some of the issues. Back then, I synchronized with manual mapping and I don't want to redo it with Go Play Along because I had a lot of trouble syncing it in the first place. I made my changes and tried to regenerate the file, but when I try to generate, I get: https://drive.google.com/open?id=10RUK0iN4XQ0vsEDdSUkdZhsoU6VrwgB8 unfortunately, I can't see the rest of the stack trace so I don't understand the problem. Can anyone help? Thanks, L P.S. I'm using the latest version