Problem in Playing YouTube Videos using Safari. It says "500 Internal Server Error" every time I am going to play video?

Is there anybody who can help me fix this issue? I encountered this problem for almost to weeks now. I can't play video on You Tube using Safari browser for my MacBook Pro. Every time I tried to play video on You Tube. It shows

"500 Internal Server Error"

Sorry, something went wrong.

A team of highly trained monkeys has been dispatched to deal with this situation. (Followed by codes)

When I checked my other computer using Google Chrome and Firefox browser. There is no problem in playing You Tube videos.