YouTube error occured, try again later

I was asked to update Adobe Flash player, which I did. Now, whenever I try to watch a video on Youtube, I get the message: An error occurred. Try again later.

Solution: If RealPlayer is installed on your system, please disable the RealPlayer Browser Record plug-in.

   Launch RealPlayer
   Click the RealPlayer icon in the upper left corner of the window and choose Preferences.
   Choose Download & Recording from the left hand panel
   Uncheck "Enable Web Download & Recording for these installed browsers"
   Click OK and close RealPlayer
   Restart Firefox

The  problem is fixed for me!!!