That usually means there is a parceing or syntax error
Opening and closing tags do not match, semicolon or colon where the other belongs...
Try and switch each file to Book view, The one(s) with errors will refuse and pop a more specific error message that includes the line number that the error was detected (the actual error may be before this point)
BTW The message says Sigil can try to auto fix the issue,but warns it might get it wrong. Your choice (I try to manual fix unknowns rather than roll the dice. )
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