My RC does not connect anymore to my Air2S drone, when I try to use Litchi

My RC does not connect anymore to my Air2S, when I try to use Litchi. It is asking me to Sync License, but when I am trying to do that, it does not works.

Make sure you are using the same Login and password that you used when you first setup Litchi.

I did, but it is giving me an error