[SOLVED] Error upon submitting a tutorial

Server Error in '/' Application.

Invalid URI: The format of the URI could not be determined.

Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.

Exception Details: System.UriFormatException: Invalid URI: The format of the URI could not be determined.

Source Error:

An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below.

Stack Trace:

[UriFormatException: Invalid URI: The format of the URI could not be determined.]
   System.Uri.CreateThis(String uri, Boolean dontEscape, UriKind uriKind) +6701413
   System.Uri..ctor(String uriString) +20
   v2.CommonFunctions.IsURLInternal(String testURL) +27
   v2.ArticleFunctions.FormatMarkup(String markup) +3648
   v2.ArticleFunctions.CreateArticle(Int32 sectionID, Int32 authorID, Int32 difficultyID, Int32 languageID, String markup, String title, Int32 categoryID) +645
   TutorialSubmit.SubmitTutorial(Object sender, EventArgs e) +6982
   System.Web.UI.WebControls.LinkButton.OnClick(EventArgs e) +116
   System.Web.UI.WebControls.LinkButton.RaisePostBackEvent(String eventArgument) +101
   System.Web.UI.WebControls.LinkButton.System.Web.UI.IPostBackEventHandler.RaisePostBackEvent(String eventArgument) +10
   System.Web.UI.Page.RaisePostBackEvent(IPostBackEventHandler sourceControl, String eventArgument) +13
   System.Web.UI.Page.RaisePostBackEvent(NameValueCollection postData) +9528682
   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +1724

Version Information: Microsoft .NET Framework Version:4.0.30319; ASP.NET Version:4.0.30319.18446[/code:xeqwri56]

Have a pleasant day.
Best regards,
Nathan[/i]