This is a detailed TS for Error 50.
First check with the CX if the PS4 intern storage has enough space
On your PS4 ™ console, go to [Settings]> [Storage].
Select the storage (system or expanded) that contains the apps you want to move.
Select [Applications] and then the application you want to move.
Press the OPTIONS button and select] or [Move to system storage].
Select the applications to move and then select [Move].
Select [OK] or [Cancel].