YUM issue: TypeError: Parsing primary.xml error

When running a ‘yum check-update’, I would receive an error. The error continued even after running ‘yum clean all’. The error is shown below: # yum check-update Setting up repositories core 100% |=========================| 1.1 kB 00:00 updates 100% |=========================| 1.2 kB 00:00 extras 100% |=========================| 1.1 kB 00:00 Reading repository metadata in from local files [...]