Re: "Package File is invalid" happens all the time
I had this before, I think I had to uninstall play store then install it back (or used titanium backup for a backup of it) anyways it had to go through a reinstall, like what demon above suggested
that or you uninstalled/disabled/froze something that it needs. I had this problem when I was learning what things I shouldn't touch lol.
Try fixing permissions too if you run out of ideas :S that seems to help on somethings
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