Unity Error on Startup ?

Well, this error is causing me some grief. For some reason this appears whenever Unity starts up and causes Intelisense on Monodevelop to not function. I've looked around the forums and answers and only found one related post, which wasn't useful. I'd appreciate any solutions.

 UriFormatException: URI scheme must start with a letter and must consist of one of alphabet, digits, '+', '-' or '.' character.
 System.Uri.Parse (UriKind kind, System.String uriString)
 System.Uri.ParseUri (UriKind kind)
 System.Uri..ctor (System.String uriString, Boolean dontEscape)
 System.Uri..ctor (System.String uriString)
 System.Xml.XmlResolver.ResolveUri (System.Uri baseUri, System.String relativeUri)
 System.Xml.XmlUrlResolver.ResolveUri (System.Uri baseUri, System.String relativeUri)
 Mono.Xml2.XmlTextReader.GetStreamFromUrl (System.String url, System.String& absoluteUriString)
 Mono.Xml2.XmlTextReader..ctor (System.String url, System.Xml.XmlNameTable nt)
 System.Xml.XmlTextReader..ctor (System.String url, System.Xml.XmlNameTable nt)
 System.Xml.XmlDocument.Load (System.String filename)
 UnityEditor.VisualStudioIntegration.SolutionSynchronizer.ReadExistingMonoDevelopProjectProperties (MonoIsland island)
 UnityEditor.DockArea:OnGUI()