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java.lang.UnsupportedOperationException: remove	at scala.collection.convert.Wrappers$MapWrapper$$anon$1$$anon$5.remove(Wrappers.scala:206)	at java.util.AbstractCollection.clear(Unknown Source)	at java.util.AbstractMap.clear(Unknown Source)	at org.apache.ftpserver.impl.DefaultFtpServerContext.dispose(DefaultFtpServerContext.java:198)	at org.apache.ftpserver.impl.DefaultFtpServer.stop(DefaultFtpServer.java:126)	at de.woq.XXX.sib.ftpserver.internal.FtpServerLifecycle.destroy(FtpServerLifecycle.java:87)	at de.woq.XXX.sib.ftpserver.internal.FTPServerActivator$$anonfun$1$$anonfun$apply$mcV$sp$1$$anonfun$apply$2$$anonfun$apply$1.apply$mcV$sp(FTPServerActivator.scala:103)	at domino.capsule.CapsuleConvenience$$anon$2.stop(CapsuleConvenience.scala:38)	at domino.capsule.DefaultCapsuleScope$$anonfun$stop$1.apply(DefaultCapsuleScope.scala:11)	at domino.capsule.DefaultCapsuleScope$$anonfun$stop$1.apply(DefaultCapsuleScope.scala:11)	at scala.collection.mutable.HashSet.foreach(HashSet.scala:79)	at domino.capsule.DefaultCapsuleScope.stop(DefaultCapsuleScope.scala:11)	at domino.service_watching.ServiceWatching$$anonfun$whenAdvancedServicePresent$1$$anonfun$apply$1.apply(ServiceWatching.scala:96)	at domino.service_watching.ServiceWatching$$anonfun$whenAdvancedServicePresent$1$$anonfun$apply$1.apply(ServiceWatching.scala:93)	at scala.Option.foreach(Option.scala:236)	at domino.service_watching.ServiceWatching$$anonfun$whenAdvancedServicePresent$1.apply(ServiceWatching.scala:93)	at domino.service_watching.ServiceWatching$$anonfun$whenAdvancedServicePresent$1.apply(ServiceWatching.scala:80)	at domino.service_watching.ServiceWatcherCapsule$$anon$1.removedService(ServiceWatcherCapsule.scala:46)	at org.osgi.util.tracker.ServiceTracker$Tracked.customizerRemoved(ServiceTracker.java:956)	at org.osgi.util.tracker.ServiceTracker$Tracked.customizerRemoved(ServiceTracker.java:864)	at org.osgi.util.tracker.AbstractTracked.untrack(AbstractTracked.java:341)	at org.osgi.util.tracker.ServiceTracker.close(ServiceTracker.java:375)	at domino.service_watching.ServiceWatcherCapsule.stop(ServiceWatcherCapsule.scala:56)	at domino.capsule.DefaultCapsuleScope$$anonfun$stop$1.apply(DefaultCapsuleScope.scala:11)	at domino.capsule.DefaultCapsuleScope$$anonfun$stop$1.apply(DefaultCapsuleScope.scala:11)	at scala.collection.mutable.HashSet.foreach(HashSet.scala:79)	at domino.capsule.DefaultCapsuleScope.stop(DefaultCapsuleScope.scala:11)	at domino.configuration_watching.ConfigurationWatcherCapsule$$anonfun$stop$1.apply(ConfigurationWatcherCapsule.scala:74)	at domino.configuration_watching.ConfigurationWatcherCapsule$$anonfun$stop$1.apply(ConfigurationWatcherCapsule.scala:74)	at scala.Option.foreach(Option.scala:236)	at domino.configuration_watching.ConfigurationWatcherCapsule.stop(ConfigurationWatcherCapsule.scala:74)	at domino.capsule.DefaultCapsuleScope$$anonfun$stop$1.apply(DefaultCapsuleScope.scala:11)	at domino.capsule.DefaultCapsuleScope$$anonfun$stop$1.apply(DefaultCapsuleScope.scala:11)	at scala.collection.mutable.HashSet.foreach(HashSet.scala:79)	at domino.capsule.DefaultCapsuleScope.stop(DefaultCapsuleScope.scala:11)	at domino.OsgiContext$$anonfun$stop$1.apply(OsgiContext.scala:67)	at domino.OsgiContext$$anonfun$stop$1.apply(OsgiContext.scala:66)	at scala.Option.foreach(Option.scala:236)	at domino.OsgiContext$class.stop(OsgiContext.scala:66)	at domino.DominoActivator.stop(DominoActivator.scala:66)	at org.apache.felix.framework.util.SecureAction.stopActivator(SecureAction.java:719)	at org.apache.felix.framework.Felix.stopBundle(Felix.java:2604)	at org.apache.felix.framework.Felix.setActiveStartLevel(Felix.java:1383)	at org.apache.felix.framework.FrameworkStartLevelImpl.run(FrameworkStartLevelImpl.java:308)	at java.lang.Thread.run(Unknown Source)