"Debugging and troubleshooting", "List of MyChat Client errors", "Error #0301".
 
Error

Error #0301: the stage with such ID (XXX) does not exist in the Kanban project
 

Error description

When adding access to Kanban project for user groups, the stage ID specified incorrectly or does not exist.

 
Problem solution

If you work with MyChat via API or directly using an open network protocol, change the transferred data.