Error message: “An error has occurred. Please try again later.” (Youtube video won't play)

This error message does not indicate a problem with your prezi but the video you are trying to add. It may appear due to one of the following reasons:

• A video is in the process of being uploaded. 
• Your Internet connection speed is slow or inconsistent. 
• A video is being removed, or having other issues. 

Here you can find YouTube's official troubleshooting tips:

https://support.google.com/youtube/answer/3037019?hl=en&rd=1

• Refresh your browser's page. 
• Change your video's quality to a lower setting. Wait for the buffer bar to start growing before clicking play in the video player and switching back to your preferred setting. 
• Try closing other tabs if you have multiple tabs open in your browser. 
• Upgrade your browser to the most recent version. 
• Update your Flash Player. You may need to install the latest version of Flash player in order to view the video. - http://get2.adobe.com/flashplayer/ 
• Enable Javascript in your browser. 
• Clear cache and cookies and restart your browser before accessing your video again. 
• Try viewing the video on a different browser or computer, if you can.