During a customization of the "Print" page of one table "Equipment", my screen flashed and then started throwing up the error "TypeError: Unable to get property 'modelId' of undefined or null reference"

This is only on the Print screen of this table. I can make a new Print1 screen (same table) that works fine but the main Print screen keeps throwing the error. It doesn't give me the option to remove the page either.
When I do a build, it builds all but the print screen

After hours of digging arround, I am pretty sure there is a file pre-build that is holding the value "modelId" This was an old field that was removed. I did a db sync after removal.
What I am asking is: What file can I delete or modifiy to remove the Main "Print" screen in page designer or what area holds that value?
Thanks all