Cannot create CDC change set

[Tom Reineri]

I'm trying to recreate CDC after dropping everything.
Received this msg below trying to create change set CDC_SET_DEV06_TM -- after change set CDC_SET_DEV06_EAI was created without error.
Any suggestions are greatly appreciated.
Thanks,
Tom

Error at line 100
ORA-26668: STREAMS process CDC$A_CDC_SET_DEV06_EAI exists
ORA-06512: at "SYS.DBMS_AQADM_SYS", line 3366
ORA-06512: at "SYS.DBMS_AQADM", line 167
ORA-06512: at line 1
ORA-01422: exact fetch returns more than requested number of rows
ORA-06512: at "SYS.DBMS_CDC_SYS_IPUBLISH", line 417