Thank you for your interest in Syncfusion product.
The reported issue is reproducable because of RegisterClientMvcResourceManager which are not registered in html page.
RegisterClientMvcResourceManager is used to enable the script and CSS files to load the assemblies used in the client file.
• It compresses the page and reduces the time taken to render the page.
• It loads the script files very fast.
• It makes it difficult to read the compressed code, and hence provides protection against theft.
In ASP.NET MVC, RegisterClientMvcResourceManager is generally added in master page.
Script file should be included in the Body section as follows.
Please refer the sample from the below link.http://files.syncfusion.com/support/grid_mvc/Incidents/F89410/Mvc_SampleGrid.zip
We would also suggest you to refer the below documentation linkhttp://help.syncfusion.com/ug_73/GridMVC/defaultMVC.html
Please let us know if you have any questions.