MyChat Client error #0210: you cannot register this email, it is already in use
Error
Error #0210: you cannot register this email, it is already in use
Error description
When registering a new user account, it turned out, that there is another account with the same email. The server settings prohibits email duplicates for new user accounts.
Problem solution
Specify another email address for a new account or disable prohibition on the server disable prohibition on the server (by default the rule is disabled).