I am trying to connect a display to the Xibo webserver

When i try to connect to the webserver i get the following error.

Client found response content type of ‘text/html’, but expected ‘text/xml’. The request failed with an empty response.

Earlier it did work and i didn’t change any settings but i wanted to try it to show it to my colleagues and now it doesnt do anything.

This is xibo 1.7.9

Both player and the CMS are 1.7.9?

Can you navigate to the CMS address in the browser on the device running the player?
What happens when you click the ‘Display Admin’ button on Xibo Player options?

Yes they are both 1.7.9.

When I go to the adress they all seem to work, also trough display admin.
I get the normal login screen.

I uninstalled the Xibo signage player and reinstaalled it, and now it seems to work so I do not exactly know what happened, but when I press save it says.
Display is active and ready to start.