code: def _raise_missing_antenna_errors(ant_uvw, max_err):
      
  
      # Find antenna uvw coordinates where any UVW component was nan
      # nan + real == nan
      problems = np.nonzero(np.add.reduce(np.isnan(ant_uvw), axis=2))
      problem_str = []
  
      for c, a in zip(*problems):
          problem_str.append("[chunk %d antenna %d]" % (c, a))
  
          # Exit early
          if len(problem_str) >= max_err:
              break
  
      # Return early if nothing was wrong
      if len(problem_str) == 0:
          return
  
      # Add a preamble and raise exception
      problem_str = ["Antenna were missing"] + problem_str
      raise AntennaMissingError('\n'.join(problem_str))
docs: Raises an informative error for missing antenna