Can not open Grib files from Nomands

Question

I am trying to read in a file from https://nomads.ncep.noaa.gov

I can read all multigrid files like here

but my script fails to read files from other links that are supposed to be Grib files such as files from here and fails with the error below

Exception has occurred: exceptions.ValueError
no matches found
  File "/buio/buio/pygrib.pyx", line 610, in pygrib.open.select

or from here

I use this python script to read the files. I guess the format must be different?