[Q] Unknown error code during application install:24 topic

Hello
I've seen answers from quite some time ago (like this :http://forum.xda-developers.com/show....php?t=1992241 ), and I'd like to know if there's a new/ more relevant solution.
I get this "Unknown error code during application install: "-24"",
Is there a way to fix it without a Factory Reset or Root?
Thanks!
Alon