MyChat Client error #0154: user UIN XX has already in the conference UID YY moderators list
"Debugging and troubleshooting", "List of MyChat Client errors", "Error #0154".
Error
Error #0154: user UIN XX has already in the conference UID YY moderators list
Error description
An error occurred while adding a user to the list of conference moderators, such an entry already exists, duplication is not possible.
Problem solution
Perhaps you are trying to make the user a moderator of the conference again, or your software does not work correctly with the open MyChat protocol.