React Native Advanced Backend

Hello, I have big problems with the given backend of the done with it app from mosh. I get all the data for my listingscreen, that’s fine. But I can’t post new listings to the backend, or get the Authtoken back from the backend. At the beginning I had problems with the backend aswell, “npm i” was not working, because the the package(-lock).json was deprecated. Do you have the same issue or a tip for me? Thank you very much!

I have the same issue. Post does not work with the backend.

Has no one got the answer for this?

Delete the package-lock. json folder, run npm I to regenerate