Sent from my Nexus 5 using XDA Premium 4 mobile app
If you didn't mod the system files then the original owner did. To resolve, flash stock factory 4.4.2 images. If you did a factory reset when you got the phone, and don't want to start over, flash the img files one at a time with fastboot (excluding userdata.img).
If you don't know how to do that, check out the stickies (I think in general). There is a very detailed thread there.
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