Default can't install any apps after flashing custom rom on my xperia x10 mini pro

i recently flashed my sony ericsson x10 mini pro with ArcMiniNxT6 with latest nAa Kernel ,and the installation was fine and i booted into my phone properly the problem is whenever i itry to install any apps it says The application (process.com.example.android.skeletonapp) has stopped unexpectedly. Please try again..this happens for every apps what is the problem ,i have google apps already installed on my phone with the rom as i can see market app on my phone,any solutions?