Urgent need help

why i cant trade pokemon in multiplayer its is always fail connect with that person
because i got trade with myself before?
thanks for helping

Try to trade with someone again, close citra and don’t open it again, open the folder C:\Users\%username%\AppData\Roaming\Citra\log and upload citra_log.txt.

what mean is upload citra_log.txt, I got that file what is the next step?

just drag and drop the citra_log.txt file into the comment field.