If you're seeing "Parse Error: There is a problem parsing the package" after downloading and attempting to install Root Mobile on your Android device you'll need to allow installation of applications from Unknown sources, also known as non-Market apps.
To enable or disable install of non-Market applications on your Android device:
1. Tap Home
2. Tap Menu
3. Tap Settings
4. Tap Applications
5. Tap Unknown sources checkbox to allow/disallow install of non-Market apps