Web interface FTP error

That’s a strange error to see. Are you still able to access FTP or the file manager after seeing that error? Is it a temporary issue or does it require password resets or something like that to fix it? My best guess is that you’re hitting some kind of upload limit, and the file manager incorrectly states that it’s a login error, or that there are too many concurrent FTP uploads. Just to check: what do the extracted files look like? Please be aware that we have a 10 MB file size limit on our hosting so any files larger than that cannot be uploaded. Like @dan3008 said: uploading your game to a specialized game hosting system will probably give you a better experience than using a web hosting account for it.