Error while parsing page, System.ArgumentNullException: Value cannot be null.
Parameter name: format
   at System.String.Format(IFormatProvider provider, String format, Object[] args)
   at System.String.Format(String format, Object arg0)
   at Medworxx.HtmlTemplate.Business.PagePartParser.Load(Guid id) in C:\dev\Modules\Medworxx.HtmlTemplate\Medworxx.HtmlTemplate.Business\PagePartParser.cs:line 118
   at Medworxx.HtmlTemplate.Business.PagePartParser..ctor(Guid id, Boolean root, String uniqueId, String initCode, List`1& parts, IPagePartDataAdapter adapter) in C:\dev\Modules\Medworxx.HtmlTemplate\Medworxx.HtmlTemplate.Business\PagePartParser.cs:line 74
   at Medworxx.HtmlTemplate.Business.PagesBusinessLogic.ParsePage(Guid pubPartId, Guid pageId, Guid siteId, String portletParms, String pageTitle, List`1& parts) in C:\dev\Modules\Medworxx.HtmlTemplate\Medworxx.HtmlTemplate.Business\PagesBusinessLogic.cs:line 92