Configuration ERROR in tagging plugin

After adding the org.onehippo.forge:ecm-tagging dependency to the CMS POM, I get an ERROR when loading the CMS browse perspective:

[INFO] [talledLocalContainer] 07.07.2014 15:04:18 ERROR http-bio-8080-exec-13 [PluginFactory.createPlugin:106] No plugin classname configured, please set plugin configuration parameter plugin.class
[INFO] [talledLocalContainer] Failed to instantiate plugin class 'null' for wicket id 'null' in plugin 'home.cluster.cms-static.plugin.navigator.cluster.cms-browser.plugin.navigator' (JcrPluginConfig:/hippo:configuration/hippo:frontend/cms/cms-browser/navigator)

The configuration node that appears to miss the plugin.class property is located at /hippo:configuration/hippo:frontend/cms/cms-browser/navigator.