@Arzeg I looked into your issue with Error: Cannot find module 'fs/promises'.
I installed the same node version as you 16.15.1 and did a fresh install of MagicMirror and MMM-Fuel.
The problem does not appear, the module is already available since node 14, see the documentation. https://nodejs.org/dist/latest-v16.x/docs/api/fs.html#promises-api
How did you install nodejs, which versions had you before on this system? How do you run the mirror? I currently assume that you might run the mirror in a way that it picks an older installation of nodejs on your system.
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