Error getting osgi plugin to activate

error.log

ERROR: Bundle com.aquent [15] Error starting/stopping bundle. (org.osgi.framework.BundleException: Activator start error in bundle com.aquent [15].)
java.lang.NoClassDefFoundError: Could not initialize class org.openid4java.consumer.ConsumerManager
	at com.aquent.openid.OpenIDRedirect.init(OpenIDRedirect.java:70)
	at org.apache.felix.http.base.internal.handler.ServletHandler.init(ServletHandler.java:55)
	at org.apache.felix.http.base.internal.handler.HandlerRegistry.addServlet(HandlerRegistry.java:65)
	at org.apache.felix.http.base.internal.service.HttpServiceImpl.registerServlet(HttpServiceImpl.java:95)
	at com.aquent.osgi.AquentActivator$1.addingService(AquentActivator.java:65)
	at com.aquent.osgi.AquentActivator$1.addingService(AquentActivator.java:55)
	at org.osgi.util.tracker.ServiceTracker$Tracked.customizerAdding(ServiceTracker.java:932)
	at org.osgi.util.tracker.ServiceTracker$Tracked.customizerAdding(ServiceTracker.java:864)
	at org.osgi.util.tracker.AbstractTracked.trackAdding(AbstractTracked.java:256)
	at org.osgi.util.tracker.AbstractTracked.trackInitial(AbstractTracked.java:183)
	at org.osgi.util.tracker.ServiceTracker.open(ServiceTracker.java:317)
	at org.osgi.util.tracker.ServiceTracker.open(ServiceTracker.java:261)
	at com.aquent.osgi.AquentActivator.registerServlets(AquentActivator.java:84)
	at com.aquent.osgi.AquentActivator.start(AquentActivator.java:39)
	at org.apache.felix.framework.util.SecureAction.startActivator(SecureAction.java:645)
	at org.apache.felix.framework.Felix.activateBundle(Felix.java:2146)
	at org.apache.felix.framework.Felix.startBundle(Felix.java:2064)
	at org.apache.felix.framework.Felix.setBundleStartLevel(Felix.java:1483)
	at org.apache.felix.framework.FrameworkStartLevelImpl.run(FrameworkStartLevelImpl.java:334)
	at java.lang.Thread.run(Thread.java:695)