Traceback error "AttributeError: 'NoneType' object has no attribute 'read' " when adding packages to Satellite channel

Issue

• custom channel seems to be corrupted
• attempting to add/remove a package from channel

• get errors like the following:

  Exception Handler Information
  Traceback (most recent call last):
   File "/usr/share/rhn/server/apacheRequest.py", line 108, in call_function
     response = apply(func, params)
   File "/usr/share/rhn/server/rhnRepository.py", line 166, in repodata
     output = repo.get_repomd_file()
   File "/usr/share/rhn/server/repomd/repository.py", line 335, in get_repomd_file
     self.compressed_repository.get_updateinfo_xml_file())
   File "/usr/share/rhn/server/repomd/repository.py", line 377, in __compute_checksums
     template_hash = self.__compute_open_checksum(timestamp, xml_file)
   File "/usr/share/rhn/server/repomd/repository.py", line 371, in __compute_open_checksum
     template_hash['open_checksum'] = self.__get_file_checksum(xml_file)
   File "/usr/share/rhn/server/repomd/repository.py", line 361, in __get_file_checksum
     chunk = xml_file.read(CHUNK_SIZE)
  AttributeError: 'NoneType' object has no attribute 'read'