Unable to load one or more of the requested types

Question

I am running into an interesting problem when using Assembly.GetTypes().  When im debugging my application through visual studio, everything works great.  When i run it on another computer that does not have visual studio installed it is throwing this error: "Unable to load one or more of the requested types"

The code that is having a problem performs a search on the assemblies and looks for any classes that inherit from a specified base class.  When a class is found, an instance is created and its execution function is called.  Here is the code that is causing the problem.

foreach(System.Reflection.Assembly oasm in AppDomain.CurrentDomain.GetAssemblies())
{
    iType = 0;
    Type[] aTypes = oasm.GetTypes(); // this line throws the exception
    // loop through all types to look for a class inheriting from CDistributionBase
    while (iType <= aTypes.Length - 1)
    {
        // if Type inherits from CDistributionBase, create instance and execute its StatusUpdate method
        if (aTypes[iType].BaseType == typeof(SSLib.Fulfillment.CDistributionBase))
        {
            odistrib = (SSLib.Fulfillment.CDistributionBase)Activator.CreateInstance(aTypes[iType]);
            odistrib.StatusUpdate();
            odistrib = null;
        }
        iType++;
    }
}

if anyone has any insight as to why this would work on my dev computer and not on my test computer, i would greatly appreciate it!

Thanks,

Josh Miller