In Sitecore 8.1, opening FormDesigner gives the following error:

[NullReferenceException: Object reference not set to an instance of an object.]
Sitecore.Forms.Shell.UI.Controls.FormSettingsDesigner.set_TitleTags(String[] value) +26 Sitecore.Forms.Shell.UI.FormDesigner.LoadControls() +795 Sitecore.Forms.Shell.UI.FormDesigner.OnLoad(EventArgs e) +123

[TargetInvocationException: Exception has been thrown by the target of an invocation.] System.RuntimeMethodHandle.InvokeMethod(Object target, Object[] arguments, Signature sig, Boolean constructor) +0
System.Reflection.RuntimeMethodInfo.UnsafeInvokeInternal(Object obj, Object[] parameters, Object[] arguments) +128
System.Reflection.RuntimeMethodInfo.Invoke(Object obj, BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture) +146 Sitecore.Reflection.ReflectionUtil.InvokeMethod(MethodInfo method, Object[] parameters, Object obj) +89
Sitecore.Web.UI.Sheer.ClientPage.OnLoad(EventArgs e) +594
System.Web.UI.Control.LoadRecursive() +68
System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +4498

The form is working fine, I think this is an upgrade issue.

  • 1
    I think you're right. That does seem to be an error in Sitecore. I think I would send that one to Sitecore Support to have them help figure this out. Nov 2, 2016 at 14:46

1 Answer 1


Check your Sitecore.Forms.dll version. If you upgraded your Sitecore instance then you also need to upgrade WFFM. Here you can find all WFFM versions - https://dev.sitecore.net/Downloads/Web_Forms_For_Marketers.aspx

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge that you have read and understand our privacy policy and code of conduct.

Not the answer you're looking for? Browse other questions tagged or ask your own question.