Message Oracle ORA-33044 - (XSAGDNGL21) AGGREGATE operator string requires a WEIGHTBY clause, but the ARGS clause in AGGMAP workspace object did not specify one.

ERROR	(XSAGDNGL21) AGGREGATE operator string requires a WEIGHTBY clause, but the ARGS clause in AGGMAP workspace object did not specify one.
CAUSE	The user used an operator which needs weight values but not provided the weight values.
ACTION	Provide weight values using a WEIGHTBY cluase.