Existing lock /var/run/yum.pid: another copy is running as pid 3307.
Another app is currently holding the yum lock; waiting for it to exit...
Another app is currently holding the yum lock; waiting for it to exit...
Another app is currently holding the yum lock; waiting for it to exit...
Another app is currently holding the yum lock; waiting for it to exit...
rm -f /var/run/yum.pid
OK