The status code 413 means that Request Entity Too Large.
The 413 status code indicates that the request was larger than the server is able to handle, either due to physical constraints or to settings. Usually, this occurs when a file is sent using the POST method from a form, and the file is larger than the maximum size allowed in the server settings.
Please try to set the maxRequestLength property to a larger value. For how, please refer to this:
http://msdn2.microsoft.com/en-us/library/e1f13641.aspx