I know that sometimes, exceptions like those, will be thrown by AU. Make sure that all of your settings that involve numbers are numbers only. Like for example, you don't want "139f" for session length or something like that.
I'm having problems running AU. Whenever I extract it and click on the .exe to run it, it's telling me that the program has stopped working before even running it. I has been working before, but now it refuses to open. I've tried downloading it again, and extracting it again, as well as restarting my computer.