Package check result: NOTE

Check: CRAN incoming feasibility, Result: NOTE
  Maintainer: ‘Moosa Rezwani <moosa.rezwani@gmail.com>’
  
  Found the following (possibly) invalid URLs:
    URL: https://www.ccb.uni-saarland.de/
      From: inst/doc/rbioapi_do_enrich.html
            inst/doc/rbioapi_mieaa.html
      Status: 503
      Message: Service Unavailable