Error while trying to read nodejs fs file?

Question

Node.js

I'm trying to read a file using fs:

fs.readFile('./cases.json', 'utf8', (err, data) => {
    if (err) {
        console.log(`Error reading file from disk: ${err}`);
    } else {
        console.log('НАКОНЕЦ')
    }
});

but it gives me this error:

TypeError [ERR_INVALID_ARG_TYPE]: The "path" argument must be of type 
string or an instance of Buffer or URL. Received an instance of Array

how to solve?