CometVisu Backend - Chart failure


this morning I updated to the latest snapshot of openhab2. Now the Charts are not working anymore in the CometVisu. The MySQL connection is fine as all charts are shown in the classic ui, and basic ui. So it is an failure in the CometVisu binding. Also I get the following error in the openhab.log:

" Could not load implementation object class org.openhab.ui.cometvisu.backend.ChartResource"

best regards René