Maybe give us a hint by showing us the full line of code, as intended and as displayed before editing.
I would examine the file as it is on the USB drive, using a hex editor program on my PC. Search for that bad string to see if it actually exists on the USB.
If it is okay before transfer, then perhaps you've got a bad bit of memory on the Haas. As a test, leave the faulty file in place on the Haas, and reload the program under a different name, which should force it into a different section of memory, hopefully an area with no faults.