Contents Index Subquery cannot return more than one row Subscription to '%1' for '%2' not found

ASA Error Messages
  Database Error Messages
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Subscription to '%1' for '%2' already exists

Item Value
SQLCODE -282
Constant SQLE_SUBSCRIPTION_NOT_UNIQUE
SQLSTATE 5RW03
Sybase error code 13644
ODBC 2 State S0002
ODBC 3 State 42S02
Parameter 1 Name of the publication.
Parameter 2 Name of the user.
Probable cause 

You attempted to create a subscription that already exists.

Contents Index Subquery cannot return more than one row Subscription to '%1' for '%2' not found