# Pastebin V7DjV3B4
async@riff:~/charms/jenkins-slave$ juju upgrade-charm --path ~/charms/jenkins-slave jenkins-slave-xenial 
Added charm "local:precise/jenkins-slave-26" to the model.
ERROR cannot upgrade application "jenkins-slave-xenial" to charm "local:precise/jenkins-slave-26": cannot change an application's series
async@riff:~/charms/jenkins-slave$ 
async@riff:~/charms/jenkins-slave$ juju upgrade-charm --switch ~/charms/jenkins-slave jenkins-slave-xenial 
Added charm "local:precise/jenkins-slave-27" to the model.
ERROR cannot upgrade application "jenkins-slave-xenial" to charm "local:precise/jenkins-slave-27": cannot change an application's series