"Debugging and troubleshooting", "List of MyChat Client errors", "Error#0289".
 
Error

Error #0289: impossible to add users to the personal group. The user list has incorrect data

 

Error description

You can't add the list of users to a personal group because of one or more problems:

1.the list has a built-in bot (UIN=0) that can't be added to a personal group;

2.the list has your UIN, you can't add yourself;

3.the list has invalid UINs of other users.

 
Problem solution

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