SSL Problem

Hey, im getting a problem with SSL on my client website and i dont know why...
The users are getting the following error:
"Security Error
There is some problems with the security certificate from this website"

When i run my website on "WhyNoPadlock" i got this:


Im using Wordpress on AWS Cloud.
Can anyone help me ?

Maybe you want to edit out your clients site off the screenshot?

Install the "Really Simple SSL Plugin" on the WordPress site and it might solve it.