Some plugins need to be updated to work with Openfire 4.6.0 or later. For most of these plugins, the updates have been implemented, but have not yet been released. You can try using a ‘SNAPSHOT’ release (which is the most recent version of the code, but untested). You can find these SNAPSHOT releases in the ‘archive’ page for each plugin, at https://www.igniterealtime.org/projects/openfire/plugins.jsp