Insufficient storage(on Android) although i have enough space(6,3gb free).

[AC Question]

I have a middle-spec android phone(Allview Viper L) and every time I try to install something from Google Play Store,just 1 second after I tap "INSTALL" its says "Insufficient storage,i have enough storage,phone storage is 3,7gb free and SD card is 6,3 free,sometimes clearing the cache memory fixed it but just for a single download,so every time I wanted to install something I had to clear the cache,but now,hovewer,that doesn't fixes it anymore,and I can't install anything,i'm seriously getting annoyed with this phone.Any solutions,please?(Sorry for my bad English,it's not my native language)