The file is probably corrupted in some way. Can you attach the whole file? Otherwise it’s impossible to say what is wrong and if it can be repaired.
It seems a v6 file tried to be open with v5.
Based on what?
KiCad’s files are text based, and if a KiCad V5 file is attempted to be opened in KiCad V5, then it should just give an error message about incompatible file versions (there is a date string on one of the first lines).
The screenshot is from KiCad V5.1.4 though, and this is very old.
KiCad V6 has many improvements, and it can also open any KiCad file made in older versions, as long as the file itself is not corrupt. If you want to stay with Kicad V5 for some reason, then at least update to V5.1.12, which has quite a lot (Almost two years worth of) of bug fixes compared to V5.1.4. KiCad 5.1.12 Release | KiCad EDA
For your error message, apparently it only went “wrong” on line 1752, so quite a lot of lines could be read. I suggest you open the file in a text editor, and then have a look at “what stands out”.
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