Cannot find runtimes due to missing drools

-install JBT (All JBoss Tools 3.2.0) from http://download.jboss.org/jbosstools/builds/nightly/3.2_stable_branch/2011-04-17_12-40-31-H720/all/repo/
-restart ide
-open Window -> Preferences and select JBoss Tools -> JBoss Tools Runtime
-add there some path

=> no runtimes are found, in the IDE log there is:

java.lang.NoClassDefFoundError: org/drools/eclipse/util/DroolsRuntimeManager
at org.jboss.tools.runtime.handlers.DroolsHandler.droolsExists(DroolsHandler.java:67)
at org.jboss.tools.runtime.handlers.DroolsHandler.exists(DroolsHandler.java:119)
at org.jboss.tools.runtime.ui.RuntimeUIActivator.runtimeCreated(RuntimeUIActivator.java:422)
at org.jboss.tools.runtime.ui.dialogs.SearchRuntimePathDialog.getServerDefinitions(SearchRuntimePathDialog.java:312)
at org.jboss.tools.runtime.ui.dialogs.SearchRuntimePathDialog.finishedRun(SearchRuntimePathDialog.java:256)
at org.eclipse.jface.dialogs.ProgressMonitorDialog.run(ProgressMonitorDialog.java:510)
at org.jboss.tools.runtime.ui.RuntimeUIActivator.refreshRuntimes(RuntimeUIActivator.java:214)
at org.jboss.tools.runtime.ui.preferences.RuntimePreferencePage$5.widgetSelected(RuntimePreferencePage.java:373)
at org.eclipse.swt.widgets.TypedListener.handleEvent(TypedListener.java:234)
...