when you download and install apps from the market, sometimes you will find that INSTALL_FAILED_CONTAINER_ERROR in the log or "Application not installed" error

they are usually SDCARD related problem, do this and reinstall your app and see if it helps:

- unmount external sdcard
goto settings-> sd card and phone storage -> unmount sd card

if you can install the app after, then it's should be sdcard related problem. to avoid or fix this permanently, do this (root is needed):

- change the permission of /mnt/secure/asec/smdl2tmp1.asec to 777
OR
- delete /mnt/secure/asec/smdl2tmp1.asec