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Editorial Team

Asked: June 14, 20262026-06-14T16:00:40+00:00 2026-06-14T16:00:40+00:00

I have an asp.net web page with a ModalPopupExtender and I’m getting the following

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I have an asp.net web page with a ModalPopupExtender and I’m getting the following error when the page loads:

Message: ‘$common’ is undefined
Line: 2
Char: 2784
Code: 0
URI: https:///ScriptResource.axd?d=RtZliaGPxbVTibdn1QCLLFCYmkQJLzmVdEg8YVHOawz2u0jp4PvhsrY5Kg6-rtio9wXKnnE88B3dPvlDZPsA89Ul_–ULFJ0EwbU35JI9_Fa4mL5XwLwQEomAqEfSv6eluWku9SSc-q_lmfPgC4bQA2&t=ffffffffbad362a4

The popup works fine on one production web server (running Windows 2003 R2) but fails on the other (running Windows 2008 R2).

Has anyone seen this before?

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1 Answer

Editorial Team
2026-06-14T16:00:41+00:00Added an answer on June 14, 2026 at 4:00 pm
I changed to ToolkitScriptManager and the error has gone away. Thanks David Stratton.
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