YouTube Has some technical problems, Internal Server Error [Updated]

If you have some problems in surfing YouTube or watching videos, you're not alone. It seems that YouTube has some technical problems which led stop working for some users.

Google didn't say anything about this but I expect that the company will share the cause in the next hours and everything will be fixed quickly.
The problem start this morning with showing a message that said "500 Internal Server Error" and the site completely stop working, then it start working Progressively but you still can't watch videos "An error occurred".

This problem is just in the Desktop version of Youtube that's mean IOS and Android users will not face the problem and they can use the app normally.

Update: Google fixed the problem and apologize for its users:
"Some people encountered errors, or a slower than normal experience on YouTube today. We worked quickly to address the issue and fixed the problem. We’re sorry for any inconvenience this caused."