re: Unknown Error code during application install: "-24" Help?
Unfortunately for me, clearing out cache and data for both Play Store & Google Play Services hasn't worked. Neither has rebooting into recovery to wipe cache & dalvik. And neither has wiping the device completely (and thus reinstalling the ROM); I'm on an LG Optimus S. ICS (4.0-4.0.4) didn't have this problem, but JB (4.1-4.2.2) DID have this problem (encountered in CM10, CM10.1, & SlimBean). It may just be a matter that affects JB & KitKat - I'm currently running CM11 and the problem is still there...along with "Package File is Invalid" and other errors.
For the most part, rooting your device, getting an app like ES File Explorer or Root Browser, going into /data/data and deleting the app folders is the only alternative...which isn't exactly a surefire thing. (For me, this worked for Zenonia 3-5, but not for Facebook or Inotia 4, for example.)
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