Hi,
Encountering this error too,
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I was trying to change this one skill's icon by making my own .dds file, didn't work and now my custom skill has no icon.
Client\Icon\ exists before I deleted it and pasted a clean Icon folder.
Checked szIcon on propskill, even copied other szIcon ".dds" values and everything has icon except for this one skill. I have a backup but I hope I'll get a fix so if this happens there's a solution ready. Sorry for necroing a 4yr old thread but if someone has a fix lmk, if I do fix it I'll post the solution here :D
Edit:
Fixed it by deleting the custom skill row on propskill.txt, and retyping everything manually. Could've screwed some spaces or '='.
cheers,