SWKeyExFatalError : Repository is not opened

Plesk Gives error like below:-

ERROR: SWKeyExFatalError
Repository is not opened

0: common_func.php3:4759
    of_get_key_by_product(string 'plesk-unix')
1: common_func.php3:4759
    getPleskKey()
2: common_func.php3:4834
    getKeyProp(string 'demo')
3: auth.php3:88

Or you will see error "Could not open Repository at "/etc/sw/keys": Cannot open file" on browser.

The solution to this error is to correct the permission of requires files/folders:-

Change it like:-

~# cd /etc/sw
~# chown -R psaadm keys
~# /etc/init.d/psa restart