asp.net ajax scriptmanager problem: The control with ID 'SomeControlId' requires a ScriptManager on the page. The ScriptManager must appear before any controls that need it (but it does)

Question

asp.net ajax scriptmanager problem:

I get a Yellow Screen of Death with:

The control with ID 'SomeControlId' requires a ScriptManager on the page. The ScriptManager must appear before any controls that need it.

BUT - there is a scriptmanager on the page, and it does work on the dev box (the error appears only on the live production server).

I've already tried:

• removing the scriptmanager,
• putting it (just) in the master page,
• putting a proxy scriptmanager in (with the scriptmanager also in the master page),

...but no luck.

Any other ideas? Will posting code help?

Update:
I installed ASP.NET 3.5 (and restarted, shortly before asking this question) but it didn't help.

Answer 1

Does your production server have the AJAX Extensions for 2.0 or ASP.NET 3.5 installed?