Why is ps4 crashing like that?

A game got a new update which has 18 GB although I have 63 GB it says it would not be possible because I apparently don't have any storage space

Is there any way to fix this error?

I just always uninstall more, so maybe the game has more memory than it says just do it.

Yeah, it reads as if almost 20GB of free memory were missing, just delete a little something.

It is not a mistake, it is intentional. You must always have enough storage space etc. For system software updates and for screenshots or saving video clips