I have the same error after applying to our new 4.2.3 installation a zenpack (our own) that was working just fine on 3.1. Zenoss 4.2.3 works fine before we apply the zenpack (we did a clean install rather than an upgrade). Our zenpack then applies a new "Add Device" menu item and dialog box. If I remove the <adapter> directive from configure.zcml, I can login fine, but without that directive my dialog box does not know how to add the device.
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