An odd problem with Bundling that didn't exist that last time I ran this project an hour ago.

I have a web forms project that was working perfectly fine an hour ago.  I came back and hit F5 and encountered the following weird error.  I really have no idea what I should do to try to eliminate this error.
If anyone has an idea of what I need to do it would be most appreciated.  This error message doesn't really exist in any usable manner when I search the Internet for it.

"The element 'styleBundle' has incomplete content. List of possible elements expected: 'include'."
The stack trace is:
[InvalidOperationException: The element 'styleBundle' has incomplete content. List of possible elements expected: 'include'.] Microsoft.AspNet.Web.Optimization.WebForms.BundleManifest.<GetXmlDocument>b__0(Object sender, ValidationEventArgs e) +130 System.Xml.DocumentSchemaValidator.InternalValidationCallBack(Object sender, ValidationEventArgs arg) +70 System.Xml.Schema.XmlSchemaValidator.SendValid ...