Problem connecting with Calaos installer

[Gabef]

Hi, I am new to the forum and to Calaos and I have just installed my first Calaos Server on a RPi Model B.
Everything works fine and I can also access to the web page.
Unfortunately when I try to connect with Calaos Installer it gives me a "Failed to load config files” error.

Can you please help me to solve it?
Could a simple reinstall work out?

Br,
Gabe