Message Oracle DRG-13310 - index owner does not have EXECUTE privilege on USER_LEXER stored procedure string

ERRORindex owner does not have EXECUTE privilege on USER_LEXER stored procedure string
CAUSEuser CTXSYS did not grant EXECUTE privilege on USER_LEXER stored procedure to the index owner
ACTIONuser CTXSYS grant EXECUTE privilege on USER_LEXER stored procedure to index owner