Subscription to '%1' for '%2' already exists

Error constant SQLE_SUBSCRIPTION_NOT_UNIQUE
ODBC 2 state S0002
ODBC 3 state 42S02
Parameter 1 Name of the publication.
Parameter 2 Name of the user.
Severity 16
SQLCODE -282
SQLSTATE 5RW03
Sybase error code 13644
 Probable cause