Permissions 0664 for 'sebenzarouterkey.pem' are too open. code example

Example 1: Permissions 0664 for '/home/kapua/keys/dev11' are too open.

chmod 600 ~/.ssh/id_rsa

Example 2: it is required that your private key files are not accessible by others

$ sudo chmod 600 /path/to/my/key.pem