deploy fails to download updated local charm

[Kevin W Monroe]

ubuntu@5e2f9eb56102:~$ juju version
2.0-beta4-trusty-amd64

ubuntu@5e2f9eb56102:~$ cat /etc/issue
Ubuntu 14.04.4 LTS \n \l

I deployed a local charm, then destroyed my model, rebuilt the local charm, created a new model, and tried to re-deploy. I see the following message in juju status:

"Waiting for agent initialization to finish"

And debug-log for the unit shows:

unit-namenode-0: 2016-04-15 17:42:48 ERROR juju.worker.dependency engine.go:526 "uniter" manifold worker returned unexpected error: preparing operation "install local:trusty/apache-bigtop-namenode-0": failed to download charm "local:trusty/apache-bigtop-namenode-0" from ["https://10.0.0.4:17070/model/1e1279e1-791f-4bf8-89c4-560e40c8bcbc/charms?file=%2A&url=local%3Atrusty%2Fapache-bigtop-namenode-0"]: expected sha256 "2d7e410ea7dbe3eb6c5572d6352b07f014ae71fa3c3160eb34455577131d2c29", got "77c621a926c81ff744e5a987df8f3492f806718970be4223dd0a864c80a8e188"

unit-namenode-0: 2016-04-15 17:42:50 ERROR juju.worker.dependency engine.go:526 "metric-collect" manifold worker returned unexpected error: failed to read charm from: /var/lib/juju/agents/unit-namenode-0/charm: stat /var/lib/juju/agents/unit-namenode-0/charm: no such file or directory

This message repeats until I do a "juju upgrade-charm" for the offending service, after which deployment continues.