XmlParseException occuring in PresentationFramework for deploys only

I am getting the following exception when I deploy my WPF app to another user's machine:

An unhandled exception of type 'System.Windows.Markup.XamlParseException' occurred in PresentationFramework.dll

However, the WPF app runs fine when I open it. The app crashes at StartUp with this message. I've double-checked to make sure .NET 3.5 SP1 is installed on their machine, and also verified th开发者_StackOverflowey can run a prototype WPF app. Is there a good way to troubleshoot this type of error?

Thanks!

---

You can setup some code to catch unhandled exceptions:

In App.Xaml

<Application 
    ...
    DispatcherUnhandledException="App_DispatcherUnhandledException" />

In App.Xaml.cs

void App_DispatcherUnhandledException(object sender, DispatcherUnhandledExceptionEventArgs e)
{
    // Add code to output the exception details to a message box/event log/log file,   etc.
    // Be sure to include details about any inner exceptions

    // Prevent default unhandled exception processing
    e.Handled = true;
}

If that doesn't uncover the exact issue, it may, at least, give you enough information to get started.