I'm running this local version of my Sitecore (Sitecore.NET 6.5.0 (rev. 120706)) website and I have these CMS changes that I want to package up with the package designer. When I go to the package designer I get this error message:

> 
> Server Error in '/' Application.
> 
> 
> Unable to load one or more of the requested types. Retrieve the
>  LoaderExceptions property for more information.
> 
> 
> Description: An unhandled exception occurred during the execution of
>  the current web request. Please review the stack trace for more
>  information about the error and where it originated in the code. 
> 
> 
> Exception Details: System.Reflection.ReflectionTypeLoadException:
>  Unable to load one or more of the requested types. Retrieve the
>  LoaderExceptions property for more information.
> 
> 
> Source Error: 
> 
> 
> An unhandled exception was generated during the execution of the
>  current web request. Information regarding the origin and location of
>  the exception can be identified using the exception stack trace below.
> 
> 
> Stack Trace: 
> 
> 
> [ReflectionTypeLoadException: Unable to load one or more of the
>  requested types. Retrieve the LoaderExceptions property for more
>  information.]  
> 
>  System.Reflection.RuntimeModule.GetTypes(RuntimeModule module) +0  
> 
>  System.Reflection.RuntimeModule.GetTypes() +9  
> 
>  System.Reflection.Assembly.GetTypes() +143  
> 
>  Sitecore.Shell.Applications.Install.Commands.Commands.Init() +63
> 
> 
> [TypeInitializationException: The type initializer for
>  'Sitecore.Shell.Applications.Install.Commands.Commands' threw an
>  exception.]  
> 
>  Sitecore.Shell.Applications.Install.Commands.Commands.Init() +0
> 
> 
> [TargetInvocationException: Exception has been thrown by the target of
>  an invocation.] System.RuntimeMethodHandle.InvokeMethod(Object
>  target, Object[] arguments, Signature sig, Boolean constructor) +0  
> 
>  System.Reflection.RuntimeConstructorInfo.Invoke(BindingFlags
>  invokeAttr, Binder binder, Object[] parameters, CultureInfo culture)
>  +639 Sitecore.Reflection.ReflectionUtil.CreateObject(Type type, Object[] parameters) +110  
> 
>  Sitecore.Web.UI.HtmlControls.CodeBeside.CreateCodeBeside(String type)
>  +35 Sitecore.Web.UI.HtmlControls.CodeBeside.OnInit(EventArgs e) +114 System.Web.UI.Control.InitRecursive(Control namingContainer) +186 System.Web.UI.Control.InitRecursive(Control namingContainer) +421 System.Web.UI.Control.InitRecursive(Control namingContainer) +421 System.Web.UI.Control.InitRecursive(Control namingContainer) +421 System.Web.UI.Control.InitRecursive(Control namingContainer) +421 System.Web.UI.Control.InitRecursive(Control namingContainer) +421 System.Web.UI.Control.InitRecursive(Control namingContainer) +421 System.Web.UI.Control.InitRecursive(Control namingContainer) +421 System.Web.UI.Control.InitRecursive(Control namingContainer) +421 System.Web.UI.Control.AddedControl(Control control, Int32 index) +189 Sitecore.Shell.DefaultPage.OnInit(EventArgs e) +197  
> 
>  System.Web.UI.Control.InitRecursive(Control namingContainer) +186  
> 
>  System.Web.UI.Page.ProcessRequestMain(Boolean
>  includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)
>  +2098
> 
> 
> Version Information: Microsoft .NET Framework Version:4.0.30319;
>  ASP.NET Version:4.0.30319.34009
> 
> 
> 

I tried to figure out what this error is, my log files don't really help me. I compared with my live site (which runs the package designer perfectly) and they are pretty much identical.

What should I look for to find the cause of this problem?