‘Sys’ is undefined – ASP.Net Ajax error

Posted on August 14, 2008 by Balaji Ramesh

I was using ASP.NET 2.0 along with Ajax Extensions 1.0. I received this error ‘Sys’ is undefined error message every time I used an Ajax control. I was pulling my hair out on it and decided to give the Control Toolkit’s web.config a glance. The following lines were not available in my web.config, so i copied them over:

<httpHandlers>
            <remove verb=”*” path=”*.asmx”/>
            <add verb=”*” path=”*.asmx” validate=”false” type=”System.Web.Script.Services.ScriptHandlerFactory, System.Web.Extensions, Version=1.0.61025.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35″/>
            <add verb=”*” path=”*_AppService.axd” validate=”false” type=”System.Web.Script.Services.ScriptHandlerFactory, System.Web.Extensions, Version=1.0.61025.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35″/>
            <add verb=”GET,HEAD” path=”ScriptResource.axd” type=”System.Web.Handlers.ScriptResourceHandler, System.Web.Extensions, Version=1.0.61025.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35″ validate=”false”/>
</httpHandlers>
<httpModules>
            <add name=”ScriptModule” type=”System.Web.Handlers.ScriptModule, System.Web.Extensions, Version=1.0.61025.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35″/>
</httpModules>

P.S: These lines go inside the System.Web section of your web.config file

Bingo.. the error vanished and all my controls started to function as they should :-)

 

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11 Responses

  1. tomas, on December 18th, 2008 at 11:45 pm Said:

    Thanks! This solved my problem

    Reply
  2. Inbe, on December 24th, 2008 at 8:52 pm Said:

    Thanks. Worked like a charm.

    Reply
  3. User links about "ajax" on iLinkShare, on January 22nd, 2009 at 3:48 pm Said:

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    Reply
  4. naveen reddy, on February 1st, 2009 at 7:19 am Said:

    good article, keep it up

    Reply
  5. Tokyo wndrer, on March 12th, 2009 at 12:18 am Said:

    Still the same error… :(

    maybe ill forget using it on 2.0

    Reply
  6. Vidhu Jain, on April 3rd, 2009 at 1:57 am Said:

    Good one. All my problems solved with this.

    Thanks

    Reply
  7. Antonio, on June 11th, 2009 at 1:56 pm Said:

    Thanks!! it worked!,

    the only problem i had after copy the code, was some hiden characters, i had to copy to notepad and replace the hex characters for “.

    Thanks!

    Reply
  8. Jakob Krebs, on June 13th, 2009 at 2:50 pm Said:

    My solution was more simple:

    Inside the tags :-)

    Have fun, Jakob

    Reply
  9. NoName, on June 22nd, 2009 at 8:40 am Said:

    Thanks.. Finally, got rid of the error!!

    Reply
  10. Bumpmer, on July 8th, 2009 at 10:32 am Said:

    FYI, initially my project worked perfectly on my local machine, but I faced the same problem on the Server which is also being configured as a DNS with active directory hosting multiple sites.

    This didn’t exactly worked for me but led me to my solution. I’ve tried many many versions of web.config that claimed to worked but just not for me. What did work for me was I have to explicitly copy the file ScriptResource.axd into my published folder. The server is running Windows Server 2003 adv server IIS6 ASP.NET 2.0 (VS 2005).

    Reply
  11. Captain Hair, on August 4th, 2009 at 12:10 pm Said:

    THANK YOU!!!

    I was pulling my hair out over this. Lost an entire day trying to resolve it. Followed your recommendation and it took care of everything.

    Again thank you for posting what you found. It would have taken me all week to get to this point. Thank you!

    Reply

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