"Debugging and troubleshooting", "List of MyChat Client errors", "Error #0021".

 

Error

Error #0021: you cannot register this nickname, it is already in use

 

Error description

There is a prohibition for a nickname duplication in the server settings. It turned out when registering a new user that a user with the same nickname already exists on the server.

 

Problem solution

Choose another nickname for a user or disable checking for nicknames duplications on the server.