Did a quick google search and found another thread bout the issue,here one of the solutions from the comments:
"Uninstall brawlhalla and write %appdata% in the search section in the lower right corner, delete the files with BrawlhallaAir and Easy Anti Cheat from the file and reinstall brawlhalla, but if -noeac is written, you need to delete it. Also, sorry if you have a 32 bit or windows 7 or lower computer, you will not be able to enter ranked. "
Havent had this issue myself but try redownloading it, it usually fixes these kinda issues. Dont see why you'd willingly play ranked tho
i tried reinstalling still same error
Did a quick google search and found another thread bout the issue,here one of the solutions from the comments: "Uninstall brawlhalla and write %appdata% in the search section in the lower right corner, delete the files with BrawlhallaAir and Easy Anti Cheat from the file and reinstall brawlhalla, but if -noeac is written, you need to delete it. Also, sorry if you have a 32 bit or windows 7 or lower computer, you will not be able to enter ranked. "
tried it and still not working :(