Oracle Message ORA-19194 - XQDY0026: It is a dynamic error if the result of the content expression of a computed processing instruction constructor contains the string ?>

ERRORXQDY0026: It is a dynamic error if the result of the content expression of a computed processing instruction constructor contains the string ?>
CAUSEAn error occurred during the processing of the XQuery expression.
ACTIONCheck the detailed error message for the possible causes.