As per http://ci.jujucharms.com/job/github-check-merge-juju/3305/consoleFull:
util_test.go:149:
c.Assert(err, jc.ErrorIsNil)
... value *errors.Err = &errors.unformatter{message:"", cause:(*params.Error)(0xc420c00f60), previous:(*errors.Err)(0xc421002dc0), file:"github.com/juju/juju/worker/uniter/resolver/loop.go", line:66} ()
... error stack:
cannot retrieve charm: cannot read charm "cs:quantal/wordpress-1" from storage: cannot get charm from model storage: resource at path "buckets/deadbeef-0bad-400d-8000-4b1d0d06f00d/charms/wordpress/1" not found
github.com/juju/juju/api/http.go:235:
github.com/juju/juju/api/client.go:528:
github.com/juju/juju/api/client.go:544:
github.com/juju/juju/downloader/download.go:130:
github.com/juju/juju/downloader/download.go:92:
github.com/juju/juju/downloader/download.go:83:
github.com/juju/juju/downloader/downloader.go:54:
github.com/juju/juju/worker/uniter/charm/bundles.go:80: failed to download charm "cs:quantal/wordpress-1" from API server
github.com/juju/juju/worker/uniter/operation/deploy.go:59:
github.com/juju/juju/worker/uniter/operation/executor.go:100: preparing operation "upgrade to cs:quantal/wordpress-1"
github.com/juju/juju/worker/uniter/resolver/loop.go:66:
This bug has not been updated in 2 years, so we're marking it Low importance. If you believe this is incorrect, please update the importance.