> p <- polygonizer(r)
  Error in ogrInfo(dsn = dsn, layer = layer, encoding = encoding, use_iconv
   = use_iconv,  :
     Cannot open data source
      In addition: Warning message:
     running command '"python" "C:Usersvr235DOWNLO~1gdal222GDAL-2~1.2swigpythonscriptsGDAL_P~2.PY"
     "C:Usersvr235AppDataLocalTempRtmpeGRpnNfile33e8d1c7717.tif" -q  -f "ESRI Shapefile"
      "C:Usersvr235AppDataLocalTempRtmpeGRpnNfile33e825205ec7.shp"' had status 127