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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.

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    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.
    – Michael Sundstrøm
    Commented Nov 2, 2016 at 14:46

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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

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