rust lifetime error

database.rs

pub struct Database<'a> {
	pub fixes: Vec<Waypoint<'a>>,
	pub countries: HashMap<String, Country>,
}

impl<'a> Database<'a> {
	pub fn new(navdata_dir: PathBuf, resources_dir: PathBuf) -> Database<'a> {
		let countries_path = resources_dir.join("icao_countries.txt");
	    let countries_path = countries_path.to_str().unwrap();

	    let waypoints_path = navdata_dir.join("waypoints.txt");
	    let waypoints_path = waypoints_path.to_str().unwrap();

		let mut db = Database {
	    	countries: HashMap::new(),
	    	fixes: Vec::new()
	    };

	    db.read_countries(countries_path);
	    db.read_fixes(waypoints_path);

	    return db;
	}
  ...
}

I'm getting this error:

error: `db` does not live long enough
  --> database.rs:35:6
   |
35 |        db.read_fixes(waypoints_path);
   |        ^^ does not live long enough
...
38 |    }
   |    - borrowed value only lives until here
   |
note: borrowed value must be valid for the lifetime 'a as defined on the block at 22:74...
  --> database.rs:22:75
   |
22 |    pub fn new(navdata_dir: PathBuf, resources_dir: PathBuf) -> Database<'a> {
   |                                                                             ^

error: aborting due to previous error