HTTPS not working with WWW. 500 Error

Can you help me out please. I have almost the same problem like samdeesh.menia.
My website is working with https but https://www is not working at all. I get this error “ is currently unable to handle this request.

I don’t know how to manage the situation and I am afraid that I will make something stupid and lose the website.
I have access to ftp , phpmyadmin, namserver etc. It is my website.

Can someone help me, please?

It’s working ok for me. http redirects to https, and www redirects to no-www. And so comes up properly no matter if I use HTTPS or not, and WWW or not.