Inserting Video from a Website not working

Hi Everyone,

I'm trying to insert a video from a Website and it is not working and I know it is something simple that I'm not doing, but I can't figure it out. Here is the embedded code from YouTube <iframe width="560" height="315" src="" frameborder="0" allowfullscreen></iframe>. I choose Insert> Video> Video from Website>and paste the code in the text box. When I click okay I get the following message. "A video cannot be inserted from this embed code. Verify that the embed code is correct and then try again." What am I doing wrong? 

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