CORB ERROR

Hi everyone! I'm trying to deploy my project. I did everything and uploaded it online (hosting etc.) But for some reason, none of my features work like add, delete, save of data. I know I set it up properly because I can log in. Anyway when I check console, I see this error about CORB. "Cross-Origin Read Blocking (CORB) blocked cross-origin response https://infinityfree.net/errors/404/ with MIME type text/html. See https://www.chromestatus.com/feature/5629709824032768 for more details." I've searched about it and I cant find any answers. Can anyone give me an insight on what I should do? Thank you very much! PS: I've read somewhere that this is a common problem when you use AJAX?