Import gcode problem

Tried to import the gcode for a cat bed that started as a .tap file. The instructions said just change the “tap” to “gcode”.Now I get this error message from Easel:
Line 25: G64 P.01
The file contains invalid G-code syntax.
Any ideas how to edit these files? I don’t have any other software (newbie).

G-Code is plain text, so you can open it up in NotePad/Textedit. See https://www.shapeoko.com/wiki/index.php/Programmatic_G-Code_Generators#G-Code_editors and https://www.shapeoko.com/wiki/index.php/Previewing_G-Code

G64 isn’t supported by Grbl, see: https://www.shapeoko.com/wiki/index.php/G-Code so you should modify your post-processor to not emit that.