I just noticed the karaf Console is full of [WARN] Messages.
13:41:30.288 [WARN ] [pse.smarthome.core.items.GenericItem] - failed notifying listener '[org.eclipse.smarthome.io.rest.sitemap.internal.PageChangeListener@3a24a381, C2MW99, f != java.lang.String]' about state update of item java.util.IllegalFormatConversionException: f != java.lang.String: {}
13:41:30.394 [WARN ] [pse.smarthome.core.items.GenericItem] - failed notifying listener '[org.eclipse.smarthome.io.rest.sitemap.internal.PageChangeListener@3a24a381, C2MW107, f != java.lang.String]' about state update of item java.util.IllegalFormatConversionException: f != java.lang.String: {}
13:41:30.828 [WARN ] [pse.smarthome.core.items.GenericItem] - failed notifying listener '[org.eclipse.smarthome.io.rest.sitemap.internal.PageChangeListener@3a24a381, C2MW97, f != java.lang.String]' about state update of item java.util.IllegalFormatConversionException: f != java.lang.String: {}
13:41:31.288 [WARN ] [pse.smarthome.core.items.GenericItem] - failed notifying listener '[org.eclipse.smarthome.io.rest.sitemap.internal.PageChangeListener@3a24a381, C2MW98, f != java.lang.String]' about state update of item java.util.IllegalFormatConversionException: f != java.lang.String: {}
13:41:31.500 [WARN ] [pse.smarthome.core.items.GenericItem] - failed notifying listener '[org.eclipse.smarthome.io.rest.sitemap.internal.PageChangeListener@3a24a381, C2MW110, f != java.lang.String]' about state update of item java.util.IllegalFormatConversionException: f != java.lang.String: {}
13:41:32.051 [WARN ] [pse.smarthome.core.items.GenericItem] - failed notifying listener '[org.eclipse.smarthome.io.rest.sitemap.internal.PageChangeListener@3a24a381, C2MW112, f != java.lang.String]' about state update of item java.util.IllegalFormatConversionException: f != java.lang.String: {}
13:41:32.883 [WARN ] [pse.smarthome.core.items.GenericItem] - failed notifying listener '[org.eclipse.smarthome.io.rest.sitemap.internal.PageChangeListener@3a24a381, C2MW109, f != java.lang.String]' about state update of item java.util.IllegalFormatConversionException: f != java.lang.String: {}
13:41:33.674 [WARN ] [pse.smarthome.core.items.GenericItem] - failed notifying listener '[org.eclipse.smarthome.io.rest.sitemap.internal.PageChangeListener@3a24a381, C2MW108, f != java.lang.String]' about state update of item java.util.IllegalFormatConversionException: f != java.lang.String: {}
13:41:39.153 [WARN ] [pse.smarthome.core.items.GenericItem] - failed notifying listener '[org.eclipse.smarthome.io.rest.sitemap.internal.PageChangeListener@3a24a381, C2MW99, f != java.lang.String]' about state update of item java.util.IllegalFormatConversionException: f != java.lang.String: {}
13:41:39.269 [WARN ] [pse.smarthome.core.items.GenericItem] - failed notifying listener '[org.eclipse.smarthome.io.rest.sitemap.internal.PageChangeListener@3a24a381, C2MW107, f != java.lang.String]' about state update of item java.util.IllegalFormatConversionException: f != java.lang.String: {}
13:41:39.714 [WARN ] [pse.smarthome.core.items.GenericItem] - failed notifying listener '[org.eclipse.smarthome.io.rest.sitemap.internal.PageChangeListener@3a24a381, C2MW97, f != java.lang.String]' about state update of item java.util.IllegalFormatConversionException: f != java.lang.String: {}
13:41:40.177 [WARN ] [pse.smarthome.core.items.GenericItem] - failed notifying listener '[org.eclipse.smarthome.io.rest.sitemap.internal.PageChangeListener@3a24a381, C2MW98, f != java.lang.String]' about state update of item java.util.IllegalFormatConversionException: f != java.lang.String: {}
13:41:40.398 [WARN ] [pse.smarthome.core.items.GenericItem] - failed notifying listener '[org.eclipse.smarthome.io.rest.sitemap.internal.PageChangeListener@3a24a381, C2MW110, f != java.lang.String]' about state update of item java.util.IllegalFormatConversionException: f != java.lang.String: {}
13:41:40.941 [WARN ] [pse.smarthome.core.items.GenericItem] - failed notifying listener '[org.eclipse.smarthome.io.rest.sitemap.internal.PageChangeListener@3a24a381, C2MW112, f != java.lang.String]' about state update of item java.util.IllegalFormatConversionException: f != java.lang.String: {}
13:41:41.761 [WARN ] [pse.smarthome.core.items.GenericItem] - failed notifying listener '[org.eclipse.smarthome.io.rest.sitemap.internal.PageChangeListener@3a24a381, C2MW109, f != java.lang.String]' about state update of item java.util.IllegalFormatConversionException: f != java.lang.String: {}
13:41:42.580 [WARN ] [pse.smarthome.core.items.GenericItem] - failed notifying listener '[org.eclipse.smarthome.io.rest.sitemap.internal.PageChangeListener@3a24a381, C2MW108, f != java.lang.String]' about state update of item java.util.IllegalFormatConversionException: f != java.lang.String: {}
13:41:48.067 [WARN ] [pse.smarthome.core.items.GenericItem] - failed notifying listener '[org.eclipse.smarthome.io.rest.sitemap.internal.PageChangeListener@3a24a381, C2MW99, f != java.lang.String]' about state update of item java.util.IllegalFormatConversionException: f != java.lang.String: {}
13:41:48.627 [WARN ] [pse.smarthome.core.items.GenericItem] - failed notifying listener '[org.eclipse.smarthome.io.rest.sitemap.internal.PageChangeListener@3a24a381, C2MW97, f != java.lang.String]' about state update of item java.util.IllegalFormatConversionException: f != java.lang.String: {}
13:41:49.084 [WARN ] [pse.smarthome.core.items.GenericItem] - failed notifying listener '[org.eclipse.smarthome.io.rest.sitemap.internal.PageChangeListener@3a24a381, C2MW98, f != java.lang.String]' about state update of item java.util.IllegalFormatConversionException: f != java.lang.String: {}
13:41:49.311 [WARN ] [pse.smarthome.core.items.GenericItem] - failed notifying listener '[org.eclipse.smarthome.io.rest.sitemap.internal.PageChangeListener@3a24a381, C2MW110, f != java.lang.String]' about state update of item java.util.IllegalFormatConversionException: f != java.lang.String: {}
13:41:49.859 [WARN ] [pse.smarthome.core.items.GenericItem] - failed notifying listener '[org.eclipse.smarthome.io.rest.sitemap.internal.PageChangeListener@3a24a381, C2MW112, f != java.lang.String]' about state update of item java.util.IllegalFormatConversionException: f != java.lang.String: {}
13:41:51.484 [WARN ] [pse.smarthome.core.items.GenericItem] - failed notifying listener '[org.eclipse.smarthome.io.rest.sitemap.internal.PageChangeListener@3a24a381, C2MW108, f != java.lang.String]' about state update of item java.util.IllegalFormatConversionException: f != java.lang.String: {}
13:41:56.980 [WARN ] [pse.smarthome.core.items.GenericItem] - failed notifying listener '[org.eclipse.smarthome.io.rest.sitemap.internal.PageChangeListener@3a24a381, C2MW99, f != java.lang.String]' about state update of item java.util.IllegalFormatConversionException: f != java.lang.String: {}
13:41:57.582 [WARN ] [pse.smarthome.core.items.GenericItem] - failed notifying listener '[org.eclipse.smarthome.io.rest.sitemap.internal.PageChangeListener@3a24a381, C2MW97, f != java.lang.String]' about state update of item java.util.IllegalFormatConversionException: f != java.lang.String: {}
13:41:58.031 [WARN ] [pse.smarthome.core.items.GenericItem] - failed notifying listener '[org.eclipse.smarthome.io.rest.sitemap.internal.PageChangeListener@3a24a381, C2MW98, f != java.lang.String]' about state update of item java.util.IllegalFormatConversionException: f != java.lang.String: {}
13:41:58.251 [WARN ] [pse.smarthome.core.items.GenericItem] - failed notifying listener '[org.eclipse.smarthome.io.rest.sitemap.internal.PageChangeListener@3a24a381, C2MW110, f != java.lang.String]' about state update of item java.util.IllegalFormatConversionException: f != java.lang.String: {}
13:41:58.796 [WARN ] [pse.smarthome.core.items.GenericItem] - failed notifying listener '[org.eclipse.smarthome.io.rest.sitemap.internal.PageChangeListener@3a24a381, C2MW112, f != java.lang.String]' about state update of item java.util.IllegalFormatConversionException: f != java.lang.String: {}
13:41:59.613 [WARN ] [pse.smarthome.core.items.GenericItem] - failed notifying listener '[org.eclipse.smarthome.io.rest.sitemap.internal.PageChangeListener@3a24a381, C2MW109, f != java.lang.String]' about state update of item java.util.IllegalFormatConversionException: f != java.lang.String: {}
13:42:00.412 [WARN ] [pse.smarthome.core.items.GenericItem] - failed notifying listener '[org.eclipse.smarthome.io.rest.sitemap.internal.PageChangeListener@3a24a381, C2MW108, f != java.lang.String]' about state update of item java.util.IllegalFormatConversionException: f != java.lang.String: {}
13:42:05.905 [WARN ] [pse.smarthome.core.items.GenericItem] - failed notifying listener '[org.eclipse.smarthome.io.rest.sitemap.internal.PageChangeListener@3a24a381, C2MW99, f != java.lang.String]' about state update of item java.util.IllegalFormatConversionException: f != java.lang.String: {}
13:42:06.019 [WARN ] [pse.smarthome.core.items.GenericItem] - failed notifying listener '[org.eclipse.smarthome.io.rest.sitemap.internal.PageChangeListener@3a24a381, C2MW107, f != java.lang.String]' about state update of item java.util.IllegalFormatConversionException: f != java.lang.String: {}
13:42:06.466 [WARN ] [pse.smarthome.core.items.GenericItem] - failed notifying listener '[org.eclipse.smarthome.io.rest.sitemap.internal.PageChangeListener@3a24a381, C2MW97, f != java.lang.String]' about state update of item java.util.IllegalFormatConversionException: f != java.lang.String: {}
13:42:06.922 [WARN ] [pse.smarthome.core.items.GenericItem] - failed notifying listener '[org.eclipse.smarthome.io.rest.sitemap.internal.PageChangeListener@3a24a381, C2MW98, f != java.lang.String]' about state update of item java.util.IllegalFormatConversionException: f != java.lang.String: {}
13:42:07.133 [WARN ] [pse.smarthome.core.items.GenericItem] - failed notifying listener '[org.eclipse.smarthome.io.rest.sitemap.internal.PageChangeListener@3a24a381, C2MW110, f != java.lang.String]' about state update of item java.util.IllegalFormatConversionException: f != java.lang.String: {}
13:42:07.682 [WARN ] [pse.smarthome.core.items.GenericItem] - failed notifying listener '[org.eclipse.smarthome.io.rest.sitemap.internal.PageChangeListener@3a24a381, C2MW112, f != java.lang.String]' about state update of item java.util.IllegalFormatConversionException: f != java.lang.String: {}
13:42:09.313 [WARN ] [pse.smarthome.core.items.GenericItem] - failed notifying listener '[org.eclipse.smarthome.io.rest.sitemap.internal.PageChangeListener@3a24a381, C2MW108, f != java.lang.String]' about state update of item java.util.IllegalFormatConversionException: f != java.lang.String: {}
13:42:14.798 [WARN ] [pse.smarthome.core.items.GenericItem] - failed notifying listener '[org.eclipse.smarthome.io.rest.sitemap.internal.PageChangeListener@3a24a381, C2MW99, f != java.lang.String]' about state update of item java.util.IllegalFormatConversionException: f != java.lang.String: {}
13:42:14.914 [WARN ] [pse.smarthome.core.items.GenericItem] - failed notifying listener '[org.eclipse.smarthome.io.rest.sitemap.internal.PageChangeListener@3a24a381, C2MW107, f != java.lang.String]' about state update of item java.util.IllegalFormatConversionException: f != java.lang.String: {}
13:42:15.359 [WARN ] [pse.smarthome.core.items.GenericItem] - failed notifying listener '[org.eclipse.smarthome.io.rest.sitemap.internal.PageChangeListener@3a24a381, C2MW97, f != java.lang.String]' about state update of item java.util.IllegalFormatConversionException: f != java.lang.String: {}
13:42:15.822 [WARN ] [pse.smarthome.core.items.GenericItem] - failed notifying listener '[org.eclipse.smarthome.io.rest.sitemap.internal.PageChangeListener@3a24a381, C2MW98, f != java.lang.String]' about state update of item java.util.IllegalFormatConversionException: f != java.lang.String: {}
13:42:16.040 [WARN ] [pse.smarthome.core.items.GenericItem] - failed notifying listener '[org.eclipse.smarthome.io.rest.sitemap.internal.PageChangeListener@3a24a381, C2MW110, f != java.lang.String]' about state update of item java.util.IllegalFormatConversionException: f != java.lang.String: {}
13:42:16.583 [WARN ] [pse.smarthome.core.items.GenericItem] - failed notifying listener '[org.eclipse.smarthome.io.rest.sitemap.internal.PageChangeListener@3a24a381, C2MW112, f != java.lang.String]' about state update of item java.util.IllegalFormatConversionException: f != java.lang.String: {}
13:42:16.840 [WARN ] [pse.smarthome.core.items.GenericItem] - failed notifying listener '[org.eclipse.smarthome.io.rest.sitemap.internal.PageChangeListener@3a24a381, C2MW111, f != java.lang.String]' about state update of item java.util.IllegalFormatConversionException: f != java.lang.String: {}
13:42:18.227 [WARN ] [pse.smarthome.core.items.GenericItem] - failed notifying listener '[org.eclipse.smarthome.io.rest.sitemap.internal.PageChangeListener@3a24a381, C2MW108, f != java.lang.String]' about state update of item java.util.IllegalFormatConversionException: f != java.lang.String: {}
13:42:23.781 [WARN ] [pse.smarthome.core.items.GenericItem] - failed notifying listener '[org.eclipse.smarthome.io.rest.sitemap.internal.PageChangeListener@3a24a381, C2MW99, f != java.lang.String]' about state update of item java.util.IllegalFormatConversionException: f != java.lang.String: {}
13:42:24.323 [WARN ] [pse.smarthome.core.items.GenericItem] - failed notifying listener '[org.eclipse.smarthome.io.rest.sitemap.internal.PageChangeListener@3a24a381, C2MW97, f != java.lang.String]' about state update of item java.util.IllegalFormatConversionException: f != java.lang.String: {}
13:42:24.786 [WARN ] [pse.smarthome.core.items.GenericItem] - failed notifying listener '[org.eclipse.smarthome.io.rest.sitemap.internal.PageChangeListener@3a24a381, C2MW98, f != java.lang.String]' about state update of item java.util.IllegalFormatConversionException: f != java.lang.String: {}
13:42:24.998 [WARN ] [pse.smarthome.core.items.GenericItem] - failed notifying listener '[org.eclipse.smarthome.io.rest.sitemap.internal.PageChangeListener@3a24a381, C2MW110, f != java.lang.String]' about state update of item java.util.IllegalFormatConversionException: f != java.lang.String: {}
13:42:25.540 [WARN ] [pse.smarthome.core.items.GenericItem] - failed notifying listener '[org.eclipse.smarthome.io.rest.sitemap.internal.PageChangeListener@3a24a381, C2MW112, f != java.lang.String]' about state update of item java.util.IllegalFormatConversionException: f != java.lang.String: {}
13:42:26.372 [WARN ] [pse.smarthome.core.items.GenericItem] - failed notifying listener '[org.eclipse.smarthome.io.rest.sitemap.internal.PageChangeListener@3a24a381, C2MW109, f != java.lang.String]' about state update of item java.util.IllegalFormatConversionException: f != java.lang.String: {}
13:42:27.170 [WARN ] [pse.smarthome.core.items.GenericItem] - failed notifying listener '[org.eclipse.smarthome.io.rest.sitemap.internal.PageChangeListener@3a24a381, C2MW108, f != java.lang.String]' about state update of item java.util.IllegalFormatConversionException: f != java.lang.String: {}
13:42:32.652 [WARN ] [pse.smarthome.core.items.GenericItem] - failed notifying listener '[org.eclipse.smarthome.io.rest.sitemap.internal.PageChangeListener@3a24a381, C2MW99, f != java.lang.String]' about state update of item java.util.IllegalFormatConversionException: f != java.lang.String: {}
Looks like its ONLY the C2 Modbus Slave
EDIT
Its not only C2 Modbus Slave others report this too