fastest rejection ever

I just had fastest rejection ever. So, I went to read the
rejection email

What should I do to avoid making the same mistakes?

We are unable to offer a critique or
feedback on your rejected submission.

What does this mean?

Cricket sound here.

I don’t think that is a serious response to a rejection.

Every design I upload is a serious work for me and I put all
my effort to do so.

I am very upset with this, because I do not know why my
design was rejected.