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Ajax control Toolkit error

Posted By:      Posted Date: October 06, 2010    Points: 0   Category :ASP.Net

hey all

i'm trying to use the ajax control toolkit but each time i'm trying to run my project i'm getting a:

"Microsoft JScript runtime error: Sys.ArgumentUndefinedException: Value cannot be undefined.
Parameter name: type "    Error.

if i hit the continue button the page loads but without the functionality of the control.

the control that i'm trying to use is the AutoCompleteExtender.

i followed all the video tutorials and read many post about this toolkit but found nothing about this error.

i tried this on both web developr 2008, 2010 and visual studio 2008.

any ideas?

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