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I've got a UserControl that contains an UpdatePanel. When I put that on a page, it throws the following error:
Cannot unregister UpdatePanel with ID 'ReviewContentUpdatePanel' since it was not registered with the ScriptManager. This might occur if the UpdatePanel was removed from the control tree and later added again, which is not supported. Parameter name: updatePanel
ReviewContentUpdatePanel is the name of the update panel & it's not being removed or added in code, it exists in the aspx page and isn't removed. Has anyone come across this before?
Have you tried including a ScriptManagerProxy in the user control?
I had this happen once before. To fix it, I just deleted it and then re-created it and the problem went away.