ScriptModule breaking my .net project from running

Question

when i take out the chunk from my web.config my project works fine. with it my project doesnt even load in a browser. with this part in my config i get a unhelpfull Runtime Error

telling me to turn on debugging... but in my config it is on!!!

<httpModules>
      <add name="ScriptModule" type="System.Web.Handlers.ScriptModule, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35"/>
</httpModules>