Simple enough. Sounds like you're missing or unable to connect to a repository in Application Manager.

• In Application Manager, click on the menu
• Then Tools->Application Catalogs...
• Look for a catalog simply called Maemo or Maemo Extras. If it exists, open it. If it doesn't exist, click New
• Check the web address/enter a new web address as http://repository.maemo.org (note that there was a bug that this was spelled incorrectly at one point, and thus didn't work)
• Distribution: chinook
• Componenets: free non-free
• Click OK to save

Should install fine now. For some reason, I don't believe that repository is enabled by default.