Trying to process content where not permitted.

Explanation

%c is only allowed in a rule of type ELEMENT, DATA-CONTENT, MARKED-SECTION IGNORE, MARKED-SECTION CDATA, MARKED-SECTION RCDATA, and MARKUP-COMMENT or in the body of a DO SGML-PARSE or DO XML-PARSEaction. Any use of it in other contexts is an error.

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