Hello Eric,

I suggest you enable SmartWebResources on your WebGrid's project.

To enable SmartWebResources in your project:

1. Right click on one of the Intersoft's control instance. For instance, WebGrid1.
2. Click Register SmartWebResources™ command in the context menu.
3. In short time after you clicked the command, you should receive a message prompt similar to the following:
   "SmartWebResources has been successfully configured for this web application."

It seems that the error pops up due to missing webgrid_core.js in your CommonLibrary folder.

You need to check your physical CommonLibrary folder whether you have included webgrid_core.js or not.

If you are using SmartWebResources, all scripts are automatically included in the project without any hassles to maintain the scripts in the physical folder.

Hope this helps.

Thank you.