What if the error message includes 'ENOENT: no such file or directory'? What does this mean in the context of 'npm run start'?

An 'ENOENT: no such file or directory' error means the script is trying to access a file or directory that doesn't exist. Double-check the file paths specified in your `start` script and in any files your script interacts with. Ensure the files are present in the expected locations and that the paths are correctly spelled and case-sensitive (especially on Linux/macOS).