It could be a class visibility problem.
I guess esper is a separate bundle and you are configuring esper in your own
bundle.
If your own bundle has a dependency on the esper bundle it the esper bundle
won't be able to see classes from your own bundle.
Add "Bundle-BuddyPolicy: dependent" to the manifest of the esper bundle.
This will allow the esper bundle to see the contents of bundles that depend
on it.

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