yum upgrade fails with "Package does not match intended download"

Issue

• Yum upgrade fails with error as: Package does not match intended download
• Getting below error while upgrading the system:

Error Downloading Packages:
  python-libs-2.6.6-64.el6.x86_64: failed to retrieve getPackage/python-libs-2.6.6-64.el6.x86_64.rpm from rhel-x86_64-server-6
error was [Errno -1] Package does not match intended download. Suggestion: run yum --enablerepo=rhel-x86_64-server-6 clean metadata