Twigmo not connecting after reinstallation


After reinstalling the newer version of Twigmo (1.9), every time I am trying to connect the add-on to my site, I am getting the following error:

[color=#9C3535][font=Tahoma, Arial, Verdana,]

Error[/font][/color][color=#9C3535][font=Tahoma, Arial, Verdana,]

The selected domain name already exists.

Invalid domain name.

Fail to create a connection.[/font][/color]

What should I do to reconnect it?