Oracle Message ORA-24032 - object string exists, index could not be created for queue table string

ERRORobject string exists, index could not be created for queue table string
CAUSEOracle AQ tried to create an index with the name specified in the error message. The index could not be created for the specified queue table because a object exists with the same name.
ACTIONDrop the object specified in the error message and retry the command. You can also choose a different name for the queue table.