unable to spawn jobq slave process, slot 0, error 1089

ERROR 1089 error 1089 Welcome to the resource topic for 20151089 Title: Linear Secret Sharing Schemes from Error Correcting Codes and Universal Hash Functions error slot #1089 Incorrect prefix key; the used key part isn't a string, the used length is longer than the key part, or the storage engine doesn't support

error 1089 Error 1089: Incorrect prefix key; the used key part isn't a string, the used length is longer than the key part, or the storage engine doesn't support unique