Open Content / MDesign Carousel template error

I'm new to DNN and Open Content. I installed 3.5.2. I imported the MDesign Carousel template. I get this error when I publish it.

Could not load file or assembly 'System.Web.Helpers, Version=2.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35' or one of its dependencies. The located assembly's manifest definition does not match the assembly reference. (Exception from HRESULT: 0x80131040)

Alias: www.co.coos.or.us
Tab: 832 - http://www.co.coos.or.us/Departments/CoosCountyFairNew.aspx
Module: 6438
Called from http://www.co.coos.or.us/Default.aspx?TabID=832.
Referrer: http://www.co.coos.or.us/Departments/CoosCountyFairNew.aspx. DotNetNuke.Services.Exceptions.ModuleLoadException: Could not load file or assembly 'System.Web.Helpers, Version=2.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35' or one of its dependencies. The located assembly's manifest definition does not match the assembly reference. (Exception from HRESULT: 0x80131040) ---> System.IO.FileLoadException: Could not load file or assembly 'System.Web.Helpers, Version=2.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35' or one of its dependencies. The located assembly's manifest definition does not match the assembly reference. (Exception from HRESULT: 0x80131040) at Satrabel.OpenContent.Components.Json.JsonUtils.JsonToDynamic(String json) at Satrabel.OpenContent.Components.Render.RenderEngine.GenerateOutputSingle(Page page, FileUri template, JToken dataJson, String settingsJson, TemplateFiles files) at Satrabel.OpenContent.Components.Render.RenderEngine.Render(Page page) at Satrabel.OpenContent.View.OnLoad(EventArgs e) --- End of inner exception stack trace ---