Global install of grunt-cli not working

Hi. I am having trouble using grunt in my projects. I am setting up an Mac osx computer with version 11.0.1.
The project files (local) are in principle correct, since I use it on another computer and it works fine there.

When trying to install grunt-cli globally I get this error:

```
npm ERR! code ENOENT
npm ERR! syscall lstat
npm ERR! path /Users/bertanicolau/.npm-packages
npm ERR! errno -2
npm ERR! enoent ENOENT: no such file or directory, lstat '/Users/bertanicolau/.npm-packages'
npm ERR! enoent This is related to npm not being able to find a file.
npm ERR! enoent

npm ERR! A complete log of this run can be found in:
npm ERR! /Users/bertanicolau/.npm/_logs/2020-11-23T17_06_23_295Z-debug.log
```

The `.npm-packages` folder does not exist in this location, instead the `.npm` folder does exist, I don't know why it is looking for another.

I have been trying to solve this error for more than two days, the problem is that the local configuration does not work correctly, since I get the message `~ bash: grunt command not found` when trying to initialize grunt with the `grunt` or `grunt watch` command

I've tried clearing the npm cache, I've also tried deleting the package-lock.json file but none of this seems to work.

Can it be a npm or node version bug?
```
$ npm -v && node -v
7.0.8
v15.2.1

```