Private key is not in the correct format

[Vilin97]

I followed the instructions in the docs to set up the SSH key. But I get this error:

[ Info: EnvVar `COMPATHELPER_PRIV` is defined, nonempty, and not `false`
[ Info: This doesn't look like a raw SSH private key. I will assume that it is a Base64-encoded SSH private key. I will now try to Base64-decode it.
ERROR: LoadError: Private key is not in the correct format. It must be a private key in PEM format. You should use the OpenSSH `ssh-keygen` command to generate the private key. You should pass the `-m PEM` option to ensure that the private key is in PEM format.