This is a bug that happens if you're using a version of mac under 10.8. We forgot to set the version requirement, so instead of telling you that it isn't supported on your mac OS version, it simply crashes. At least that's what I'm guessing in your case. Are you on 10.7 or below? If so then that's the problem. You just need to update to 10.9 (which is free on the app store)
If it's not the mac OS version however and you're on 10.8.5+, then press "Report" and give me the crash report.