Oracle Solution for Error ora-23477

ORA-23477: unable to alter propagation mode for object group "string"."string"

What triggered the Error:

e propagation method of a materialized view object group can only be altered when no other object groups with the same master object group are sharing the materialized view site.

What should we do to fix it:

sure that there are no other materialized view object groups at the local site with the same master object group.