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Issue with external link dialogue when adding it using Monoco's Link List Module with sitecore 8.1

Hi ,

We have implemented Monoco.CMS Sitecore market place, module for adding LinkListField as a custom field which behaves as a linklist field for Internal, external and Media URLs. This is working fine with older sitecore version i.e. 6.6 but once we upgraded sitecore version with 8.1 update3, since then we are not able to add External Links to this Link list field. Whenever i click on "External Link field ", blank modal dialog appears. below are the two screenshots of the error. 

4548 13:11:19 ERROR Application error.
Exception: System.Web.HttpUnhandledException
Message: Exception of type 'System.Web.HttpUnhandledException' was thrown.
Source: System.Web
   at System.Web.UI.Page.HandleError(Exception e)
   at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)
   at System.Web.UI.Page.ProcessRequest(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)
   at System.Web.UI.Page.ProcessRequest()
   at System.Web.UI.Page.ProcessRequest(HttpContext context)
   at System.Web.HttpApplication.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute()
   at System.Web.HttpApplication.ExecuteStepImpl(IExecutionStep step)
   at System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously)

Nested Exception

Exception: System.Reflection.TargetInvocationException
Message: Exception has been thrown by the target of an invocation.
Source: mscorlib
   at System.RuntimeMethodHandle.InvokeMethod(Object target, Object[] arguments, Signature sig, Boolean constructor)
   at System.Reflection.RuntimeMethodInfo.UnsafeInvokeInternal(Object obj, Object[] parameters, Object[] arguments)
   at System.Reflection.RuntimeMethodInfo.Invoke(Object obj, BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture)
   at Sitecore.Reflection.ReflectionUtil.InvokeMethod(MethodInfo method, Object[] parameters, Object obj)
   at Sitecore.Reflection.ReflectionUtil.CallMethod(Object obj, String methodName, Boolean includeNonPublic, Boolean includeInherited, Object[] parameters)
   at Sitecore.Web.UI.Sheer.ClientPage.OnLoad(EventArgs e)
   at System.Web.UI.Control.LoadRecursive()
   at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)

Nested Exception

Exception: System.InvalidOperationException
Message: Handle not found.
Source: Sitecore.Kernel
   at Sitecore.Web.UrlHandle.Get(UrlString urlString, String handleName, Boolean removeSessionValue)
   at Sitecore.Shell.Applications.Dialogs.LinkForm.GetLink()
   at Sitecore.Shell.Applications.Dialogs.LinkForm.OnLoad(EventArgs e)
   at Sitecore.Shell.Applications.Dialogs.ExternalLink.ExternalLinkForm.OnLoad(EventArgs e)



4548 13:11:20 WARN  Request is redirected to document not found page. Requested url: /500.aspx?aspxerrorpath=/sitecore/shell/Applications/Dialogs/External%20Link.aspx, User: sitecore\admin, Website: mysite

 

 



thanks,
Hiral Shah