Oracle Message ORA-19295 - XQST0060: It is a static error if the name of a function in a function declaration is not in a namespace (expanded QName has a null namespace URI)

ERRORXQST0060: It is a static error if the name of a function in a function declaration is not in a namespace (expanded QName has a null namespace URI)
CAUSEAn error occurred during the processing of the XQuery expression.
ACTIONCheck the detailed error message for the possible causes.