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How to Use a update panel on Sharepoint, I had one Update Panel, and when I put in him elements of the site i get a JavaScript Error: sys.argumentnullexception value cannot be null. I try find a SafeScriptManager, but I can't find him. Can You help me. Please

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That error show when I try to edit a page – Grzegorz Z Oct 18 '12 at 7:42

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