Modules are loaded and started before PluginManager is created. We need to create the PluginManager before loaded modules and then start the plugin manager.
Know exception for this problem:
Exception in thread "Update Manager" java.lang.NullPointerException
at org.jivesoftware.wildfire.update.UpdateManager.buildPluginsUpdateList(UpdateManager.java:573)
at org.jivesoftware.wildfire.update.UpdateManager.loadSavedInfo(UpdateManager.java:699)
at org.jivesoftware.wildfire.update.UpdateManager.access$000(UpdateManager.java:46)
at org.jivesoftware.wildfire.update.UpdateManager$1.run(UpdateManager.java:104)