Using v2.2.5 on device Oneplus 7 android 10
I have tried clearing data and cache, signing out and reinstalling app.
The hint on reddit doesn´t help?
…and welcome to the moviebase forum 
Nope. Also app works on mobile data but i get this errror on wifi.
Seems to is being blocked when using wifi. Try using any free vpn when on wifi to confirm the issue
Yes it works with a vpn. But it used to work on my wifi network. There is something i can do to rectify it?
So sorry to inform but I think your ISP may have blocked websites that are needed for moviebase to function properly. It is very annoying as it seems. The most you can do is make a request to them to unblock trakt/tvdb/IMDb and other relevant websites. Your ISP must have mistaken trakt with piracy.
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As @KapilTapsi already mentioned, it seems that the internet service provider may have blocked the websites / API data.
Is the website https://www.themoviedb.org working for you?
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Nope its not working.
Then the ISP has blocked the website and content 
Maybe the support team of TMDb could help you to fix this issue.
I have the same issue but with mobile data not with Wi-Fi. The easy way to solve it its installing an app called 1.1.1.1 which changes your dns.
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The problem is that the ISP/network provider blocks TMDB content. This is a common issue for many years ago.