Try going to the config file, i.e C:\Users\who ever\.ssh\config and placing quotes around the Identity File path.
Host git.ionicjs.com
IdentityFile "C:\Users\who ever\.ssh\ionic\012345_rsa"
Like so. This should fix the problem, depending on your user name. if there’s a space anywhere in the path, as there is between who and ever, the result is garbage