message: show errors to user
diff: @@ -75,7 +75,9 @@ export class TaskUnitComponent implements OnInit {
  this.progress = savedProgress;
  this.snackBar.open('Progress has been saved', '', {duration: 3000});
  })
  - .catch(() => this.snackBar.open('An unknown error occurred', '', {duration: 3000}));
  + .catch((err) => {
  + this.snackBar.open(`An error occurred: ${err.json().message}`, '', {duration: 3000})
  + });
  }
  }
  }
  