Why can't I renew my foreign worker's permit (PLKS)?

Why can't I renew my foreign worker's permit (PLKS)?

It may be because
  1. The permit expiry date is less than 7 days.
  2. The balance of the passport validity is less than 1 year.
  3. Passport has expired
  4. FOMEMA medical check-up failed.
  5. No valid insurance.
  6. ‚ÄčThe foreign worker or employer is blacklisted.