Since yum could not recognize the repository, when I tried to check the subscription information, I got the following message.

subscription-manager list

Unable to find Subscription Manager module.
Error: /usr/lib64/python2.6/site-packages/_xmlplus/parsers/pyexpat.so: symbol XML_SetHashSalt, version EXPAT_2_0_1_RH not defined in file libexpat.so.1 with link time reference

What should I do?