TypeLoadException: Could not load type 'NopSolutions.NopCommerce.Common.Configuration.NopConfig' from assembly 'Nop.Common, Version=1.9.0.0,

i had version 1.30, i copied the database to a new database and the website to a new website.
ran all the sql upgrade scripts to get from 1.3->1.4->1.5-->1.6->1.7->1.8->1.9
copied the nosource files on top of the copied files on the new website. changed connection strings to be appropriate

started it up and got this dump. any ideas? iis7.5 on W2k8. app pool using network service and full trust.


[TypeLoadException: Could not load type 'NopSolutions.NopCommerce.Common.Configuration.NopConfig' from assembly 'Nop.Common, Version=1.9.0.0, Culture=neutral, PublicKeyToken=null'.]
   ASP.global_asax.Application_Start(Object sender, EventArgs e) +0

[HttpException (0x80004005): Could not load type 'NopSolutions.NopCommerce.Common.Configuration.NopConfig' from assembly 'Nop.Common, Version=1.9.0.0, Culture=neutral, PublicKeyToken=null'.]
   System.Web.HttpApplicationFactory.EnsureAppStartCalledForIntegratedMode(HttpContext context, HttpApplication app) +3988565
   System.Web.HttpApplication.RegisterEventSubscriptionsWithIIS(IntPtr appContext, HttpContext context, MethodInfo[] handlers) +191
   System.Web.HttpApplication.InitSpecial(HttpApplicationState state, MethodInfo[] handlers, IntPtr appContext, HttpContext context) +325
   System.Web.HttpApplicationFactory.GetSpecialApplicationInstance(IntPtr appContext, HttpContext context) +407
   System.Web.Hosting.PipelineRuntime.InitializeApplication(IntPtr appContext) +375

[HttpException (0x80004005): Could not load type 'NopSolutions.NopCommerce.Common.Configuration.NopConfig' from assembly 'Nop.Common, Version=1.9.0.0, Culture=neutral, PublicKeyToken=null'.]
   System.Web.HttpRuntime.FirstRequestInit(HttpContext context) +11529072
   System.Web.HttpRuntime.EnsureFirstRequestInit(HttpContext context) +141
   System.Web.HttpRuntime.ProcessRequestNotificationPrivate(IIS7WorkerRequest wr, HttpContext context) +4784373