Error: Can not find module dotenv

I installed modele as Dev:

C:\Users\mrgen\OneDrive> npm i dotenv --save-dev
    npm WARN [email protected] No description
    npm WARN [email protected] No repository field.        

    audited 299 packages in 3.987s
    found 0 vulnerabilities

The configuration file has been updated correctly:

Thefilewasimportedwithrequire():

When I run the file, see what happens:

C:\Users\mrgen\OneDrive> node src/index

module.js:549
    throw err;
    ^

Error: Cannot find module 'dotenv'
    at Function.Module._resolveFilename (module.js:547:15)
    at Function.Module._load (module.js:474:25)
    at Module.require (module.js:596:17)
    at require (internal/module.js:11:18)
    at Object.<anonymous> (C:\Users\mrgen\OneDrive\src\index.js:14:1)
    at Module._compile (module.js:652:30)
    at Object.Module._extensions..js (module.js:663:10)
    at Module.load (module.js:565:32)
    at tryModuleLoad (module.js:505:12)
    at Function.Module._load (module.js:497:3)
    at Function.Module.runMain (module.js:693:10)
    at startup (bootstrap_node.js:191:16)
    at bootstrap_node.js:612:3

This does not happen if I install dotenv on the project. Am I calling the module the wrong way? Why can not the node find the module?