asp.net - Error building empty website in VS2012 -


i using visual studio 2012 update 3 , whenever create new asp.net empty website , build first time compilation successful server error when accessing site of "could not load file or assembly 'system.web.extensions, version=4.0.0.0, culture=neutral, publickeytoken=31bf3856ad364e35' or 1 of dependencies. module expected contain assembly manifest."

if go , build website again single error of "object reference not set instance of object" no line number.

this error occurs whichever framework targeting , whether using c# or vb.

can point me in right direction please?

thanks, richard.

possibly ajaxcontrol toolkit issue.

depending on framework version( 4.5, 4.0, 3.5 ),, install correct version of ajaxcontrol toolkit here: http://ajaxcontroltoolkit.codeplex.com/releases/view/94873.

another solution found place system.web.extensions.dll , system.web.extensions.design.dll directly in bin folder of web application.


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