What if the 'file not found' error occurs within a task defined in `tasks.json`?

If a task defined in `tasks.json` reports 'file not found', verify the `command` and `args` properties in your task definition. Ensure the paths used within these properties are correct and relative to the workspace root or an absolute path. Check environment variables used within the task definition for accuracy. Try running the task from the command palette to see detailed error output.