error:0906A068:PEM routines:PEM_do_header:bad password read'

When I used icontrol to create LocalLBProfileClientSSL, it shows error, why it shows this error. error:0906A068:PEM routines:PEM_do_header:bad password read'

 

But as I canceled the key passphrase, it works successfully.

 

On F5 , i cannot find any password feature on SSL certificate List on website ，when I import certificate and keys with

 

password.how to deal with the error ? I want to use a password to encrypt the key and certificate, and import them into F5,from the website and icontrol.