There’s currently a (non-critical) bug in the application as the source for the TFL data has changed slightly (in certain circumstances). I’ve fixed it in my trunk repository but I’m currently without internet access during a house move. A new version should be uploaded shortly.

The error message your refering to is a supporting assembly that lets you view exception details from applications written in the .NET Compact Framework. It effectively means that the app is throwing an exception, but because you don’t have the developer tools installed on your device that you don’t have the information to parse that error.

If this is happening when you start up the application and not during the use of it, it’s possible you don’t have the .NET Compact Framework installed on your device – that could fix the issue.