"Debugging and troubleshooting", "List of MyChat Client errors", "Error #0325".
 
Error

Error #0325: user group identifiers list contains incorrect or non-existent elements
 

Error description

When deleting one or more groups in the custom user menu, it turned out that the list contains incorrect or non-existent identifiers.
 
Problem solution

An error may occur if you use a third-party client to work with MyChat Server or make your own implementation of MyChat open protocol. You should check if you specified everything correctly in the  cs_remove_groups_from_custom_menu.