Unable to create directory /.minecraft

When pressing the PLAY button to launch Minecraft Java Edition v. 1.15.2, there is an error:

Unable to create directory.

Error details: Permission denied.

Filename in disk: .minecraft

Path: /.minecraft

Exists: Nonexistent

 

(Translated by me from Spanish)

I've read other similar reports related to Windows. This is an OSX. How can we solve it? What's the path of the directory that should be created?