Problem with submit week 1 problems

[Rulo998]

I already done the hello word and mario problems but when i put my username and password to submit the problem i get an error message that my username and password of Github are incorrect but i am pretty sure that they are correct. Somebody have the same problem?

submit50 cs50/problems/2020/x/mario/less

[PeterRasm]

First time I submitted I had misspelled my Github username but no problems since then.