Error

Error #0336: MyChat Client error #0336: user group ID XXX is already included in the conference UID YYY
 

Error description

ВYou are trying to add a group of users to an auto-created conference but the group is already there.

 
Problem solution

Usually this issue occurs when you work with MyChat Server directly by using an official open protocol. Make sure that you specified a conference UID and user group ID correctly. Duplicates are not possible because these numbers are unique and must not repeat.