Iode´ F-Droid Repository not available: Invalid Response

Hello,

for some days now I get the following message via F-Droid (using Neostore) when I want to synchronise the iode´ repo:

Ungültige Serverantwort. Invalid response: HTTP 404.

What could be the reason for that?

If I check the repo it also says, that the last update was on the 12th of february this year.