Why does one get the warning "erase unlink of /lib/modules/2.6.32-573.18.1.el6.x86_64" after update?

Issue

• While patching RHEL 6.8 server, warning messages are generated

Cleanup    : kernel-2.6.32-573.18.1.el6.x86_64                          
warning:    erase unlink of /lib/modules/2.6.32-573.18.1.el6.x86_64/weak-updates failed: No such file or directory
warning:    erase unlink of /lib/modules/2.6.32-573.18.1.el6.x86_64/modules.order failed: No such file or directory
warning:    erase unlink of /lib/modules/2.6.32-573.18.1.el6.x86_64/modules.networking failed: No such file or directory
warning:    erase unlink of /lib/modules/2.6.32-573.18.1.el6.x86_64/modules.modesetting failed: No such file or directory
warning:    erase unlink of /lib/modules/2.6.32-573.18.1.el6.x86_64/modules.drmfailed: No such file or directory
warning:    erase unlink of /lib/modules/2.6.32-573.18.1.el6.x86_64/modules.block failed: No such file or directory