ORA-43572
Cannot string index with name 'string' on the notification table 'string'.'string'
Cause
Cannot drop the default index created on the notification table or cannot create an index that conflicts with the default index name created on the notification table.
Action
Use a different index name for creating an index on the notification table or use alter directive statement to modify the key columns of the default index of the notification table or use drop directive statement for dropping the default index of the notification table along with the directive.