SSL Cerificate - Manual Install issue

My client sent me his own certificate with provate key.
I tried to install it with SSL Cerificate - Manual Install
I have fill forms with data then click Generate Intermediate and Save button.
I get message that certs was saved.
I have reboted Apache.

After that site stop worked. I saw that apache vhost was generated without triling slash at document root

i had the same problem
the problem is with privet key is wrong

i have tried everything until i found in my old backup (from cpanel ) many keys i tried every one until i found the correct one .
sorry for my english