Extender Provider failed to return an Extender Extender Provider failed to return an Extender asp.net asp.net

Extender Provider failed to return an Extender


c# asp.net .net-3.5

I encountered the

The Extender Provider failed to return an Extender for this object.

message in a winforms designer window.

I'm aware that your question is about ASP.Net 3.5, but in my case I resolved it by:

  • Closing the solution in Visual Studio
  • Deleting the obj and bin directories from the problematic project.

When I reopened the solution the error no longer occurred in the designer.

UPDATE:

VS 2019, resolution still relevant

c# asp.net .net-3.5

I solved it by just closing Visual Studio and opening it again. I was using Visual Studio 2015 Community Edition and didn't have to delete those folders.

c# asp.net .net-3.5

In my case run Visual Studio as administrator helped. My project uses local IIS and Studio needs Admin permissions to manage IIS.

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