500 Error When Accessing cPanel

Sorry for my english!
The probleme is next:

I try to enable/activate this option: "User-Feature Manager"
I typed my password to confirm this, and hit the "Enable User-Feature Manager" button.
After this come to this site:

[Removed - Please attach images directly to the thread]

And when I type my cpanel password at the full-featured Contorl Panel box, I get this message:

Internal Server Error 500
No response from subprocess (cpanelphp) subprocess exited with status 2

I called my website's host company, called - Removed -, and they said that this is a main bug of the CPanel, and they asked the company earlier to solve it, but they didn't do this.

What is the problem? Is this really cPanel's mistake, or the host's company? I'm a little confused...
What can I do cPanelMichael?