Jailbroken ipod touch 2g 2.2.1 apps show up but cannot be opened!?

So i installed quick freedom and jailbroke my ipod touch, and than i installed mobileinstallation patch and i installed installous as well abut whenever i try and install the app it always says "unable to find executable" so i change the settings to "dirty" and than app shows up but it can't be opened. any suggestions?