When i use the private key with passphrase, i get the exception System.NotSupportedException:“Key 'ENCRYPTED' is not supported.”

[Alimjan124]

When i use the private key with passphrase, i get the exception System.NotSupportedException:“Key 'ENCRYPTED' is not supported.”
this is my code :
var client = new SshClient(sshHostName, sshPort, sshUserName, new PrivateKeyFile(sshKeyFilePath, sshKeyFilePassword))

and my private key generated with openssl genpkey -algorithm RSA -aes-256-cbc -outform PEM -out private_key.pem -pkeyopt rsa_keygen_bits:2048