In this video I show how you remove and get rid of those warnings and errors in red writing from cydia, I recently had problems with Installous, cydia kept saying it couldn't re-write a file belonging to it, because of this Installous did not work at all, and many of my other files wouldn't work, I downloaded icleaner and cleaned my device, now all those problems are gone! I deleted Installous (which I couldn't do before because of the errors) and reinstalled it. Works like a charm :D