How to print gcode that is not from a slicer?

I am looking to do a max flow test that CNC kitchen developed & then someone made a website generator for it https://hotend-flow-tester.netlify.app/ The problem is when I try to print the gcode from this I get this error message What do йneed to add to the gcode text file to get it to work?
Hotend Flow Test Gcode Generator
Generate Gcode to test your 3D printer's maximum hotend flow rate at different temperatures.
Solution:
add this to your printer.cfg:
allow_unsupported_slicer_versions: True
allow_unsupported_slicer_versions: True
...
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Solution
Chris
Chris2w ago
add this to your printer.cfg:
allow_unsupported_slicer_versions: True
allow_unsupported_slicer_versions: True

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