[Q] insufficient storage problem topic

guys i have 50 gb of free space in my opo but still when i try to install apps it shows memory full...searched google for solution but didnt find...when i try to install insufixer app it still shows the same error...can somebody plz help me out...am totally pissed off coz of this...didnt face such problems with my last sony phone....plzzzzzzzzzzz a solution