Thanks for the file.
No need to remove the .swc. Just set its path to be relative. One issue that may be leading to this invalid data error is that you have a couple of duplicate labels in severals symbols.
WARNING: Duplicate label, Symbol=knightswordoiled5, Layer=Layer 1, Frame=12, Label=ani
WARNING: Duplicate label, Symbol=knightmanoiled4, Layer=Layer 1, Frame=12, Label=ani
WARNING: Duplicate label, Symbol=knightmanoiled, Layer=Layer 1, Frame=12, Label=ani
WARNING: Duplicate label, Symbol=knightman2, Layer=Layer 1, Frame=12, Label=ani
WARNING: Duplicate label, Symbol=knightswordoiled3, Layer=Layer 1, Frame=12, Label=ani
WARNING: Duplicate label, Symbol=knightswordoiled2, Layer=Layer 1, Frame=12, Label=ani
WARNING: Duplicate label, Symbol=knightswordoiled, Layer=Layer 1, Frame=12, Label=ani
WARNING: Duplicate label, Symbol=knightman, Layer=Layer 1, Frame=12, Label=ani
WARNING: Duplicate label, Symbol=knightsword5, Layer=Layer 1, Frame=12, Label=ani
WARNING: Duplicate label, Symbol=knightswordoiled4, Layer=Layer 1, Frame=12, Label=ani
WARNING: Duplicate label, Symbol=knightsword4, Layer=Layer 1, Frame=12, Label=ani
WARNING: Duplicate label, Symbol=knightsword3, Layer=Layer 1, Frame=12, Label=ani
WARNING: Duplicate label, Symbol=knightsword2, Layer=Layer 1, Frame=12, Label=ani
WARNING: Duplicate label, Symbol=knightsword, Layer=Layer 1, Frame=12, Label=ani
WARNING: Duplicate label, Symbol=knightman5, Layer=Layer 1, Frame=12, Label=ani
WARNING: Duplicate label, Symbol=knightman4, Layer=Layer 1, Frame=12, Label=ani
WARNING: Duplicate label, Symbol=knightman3, Layer=Layer 1, Frame=12, Label=ani
I think it's worth fixing these to be sure.
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