Error: Only one instance of a ScriptManager can be added to the page

asp.net webforms scriptmanager clientscriptmanager
Ching Chang Chung picture Ching Chang Chung · Nov 19, 2013 · Viewed 11.2k times · Source

I got this Error when I added ScriptManager on a "Site.Master" (Master Page)

All child webForm of site.Master that contains ScriptManager. produce this error.....

Only one instance of a ScriptManager can be added to the page.

help Thanks

Answer

Shai Aharoni picture Shai Aharoni · Nov 19, 2013

You probably have another instance of in one of the pages /user controls that inherits from this master page.

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