Rejected project please help me. why hard reject my project?

What reason did you not accept this project?
that’s mean my 30 days work was for 0 $? It is not true

But if my project have a problem ,say me , I’ll solve that problem. But do not simply refuse it please.

Please refrain from creating multiple threads on the same topic. You’ve already created a previous thread regarding this rejected project.

I have also this problem. I don’t know the reason for rejection. They just simply say “it isn’t at the quality standard required”. Want to know what is there quality standard required?