CUSTOMFILOPERR, Error while doing oooo operation on file ffff

Run Time Error: This indicates that the operating system reported an error while performing operation oooo on custom errors file ffff.

Action: Check that ffff is a proper path to the custom errors file. If it is incorrect, set the gtm_custom_errors environment variable to point to the correct file. If the file path is correct, verify that the user has access to the file and correct any permissions issues.