I just went through all of the code files and searched for “custom”. Then deleted the line with that in it. It was a bit of trial and error.
I figured out where the css file was being requested and deleted the line of code – problem solved.
That was supposed to read ‘how can I fix this problem, please’!
The address for the file is http://www.jackmfuller.com/wp-content/themes/Cutline%202.2/custom.css
Can I work out what code is looking for this file and what role the file should be playing?