Vikunja says I am offline

I’m not sure that I have a solution but I’ve been experiencing something similar. I’ve been poking it a lot to ensure that I can easily reinstall and restore without issues if/when something breaks.

That’s my post. What does your error say, specifically? The one you get in the browser. Can you post a screenshot? I get something like this, and I wondered if yours was similar:

Does yours complain about the API URL being correct, or something else?