'Object reference not set to an instance of an object' error when trying to do a new query in DAX

Question

This is very frustrating, I just installed SSMS 18.8 and when I try to do something extremely basic like opening a 'new query' for DAX, I get this error:

How can I fix this?

Detail of the error:

TITLE: Microsoft SQL Server Management Studio

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Object reference not set to an instance of an object. ( at Microsoft.VisualStudio.Text.Editor.Implementation.WpfTextView.UnsubscribeFromEvents()
at Microsoft.VisualStudio.Text.Editor.Implementation.WpfTextView.Close()
at Microsoft.VisualStudio.Text.Editor.Implementation.WpfTextViewHost.Close()
at Microsoft.VisualStudio.Editor.Implementation.SimpleTextViewWindow.CloseExistingWpfTextView()
at Microsoft.VisualStudio.Editor.Implementation.SimpleTextViewWindow.CloseBufferRelatedResources()
at Microsoft.VisualStudio.Editor.Implementation.SimpleTextViewWindow.CloseView()
at Microsoft.VisualStudio.Editor.Implementation.CompoundTextViewWindow.Close()
at Microsoft.SqlServer.Management.UI.VSIntegration.ShellCodeWindowControl.UnsinkEventsAndFreeInterfaces()
at Microsoft.SqlServer.Management.UI.VSIntegration.ShellTextEditorControl.Dispose(Boolean disposing)
at System.ComponentModel.Component.Dispose()
at Microsoft.SqlServer.Management.UI.VSIntegration.Editors.ScriptEditorControl.Dispose(Boolean bDisposing)
at Microsoft.SqlServer.Management.UI.VSIntegration.Editors.ScriptAndResultsEditorControl.Dispose(Boolean bDisposing)
at Microsoft.SqlServer.Management.UI.VSIntegration.Editors.MdxScriptEditorControl.Dispose(Boolean bDisposing)
at Microsoft.SqlServer.Management.UI.VSIntegration.ShellWindowPaneUserControl.OnWindowPaneClose()
at Microsoft.SqlServer.Management.UI.VSIntegration.ShellWindowPaneUserControl.ClosePane()
at Microsoft.VisualStudio.Platform.WindowManagement.WindowPaneDocumentObject.<>c__DisplayClass19_0.<DisposeManagedResources>b__0()
at Microsoft.VisualStudio.ErrorHandler.CallWithCOMConvention(Action method, Boolean reportError))

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BUTTONS:

OK

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Answer 1

Hi,

For this issue , first of run an update to the system, patch the newest update, see if this fix your issue . If not, you could try :

1. You could try the solution 1 in this : Solution 1 - Run Fixit tool for KB4074906
2. You could try uninstalled the security patch KB 4055002 from .Net framework see if it works.

Regards,
Lukas

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