I'm guessing some transformSources have been unregistered, but not removed from the registration list.
ERROR: Bundle org.switchyard.karaf.switchyard-karaf-deploy [151] Error stopping bundle. (java.lang.IllegalStateException: Service already unregistered.)
java.lang.IllegalStateException: Service already unregistered.
at org.apache.felix.framework.ServiceRegistrationImpl.unregister(ServiceRegistrationImpl.java:123)
at org.switchyard.deploy.osgi.internal.SwitchYardExtender.doStop(SwitchYardExtender.java:91)
at org.switchyard.deploy.osgi.base.AbstractExtender.stop(AbstractExtender.java:139)
at org.apache.felix.framework.util.SecureAction.stopActivator(SecureAction.java:667)
at org.apache.felix.framework.Felix.stopBundle(Felix.java:2361)
at org.apache.felix.framework.Felix.setActiveStartLevel(Felix.java:1214)
at org.apache.felix.framework.FrameworkStartLevelImpl.run(FrameworkStartLevelImpl.java:295)
at java.lang.Thread.run(Thread.java:662)
ERROR: Bundle org.switchyard.karaf.switchyard-karaf-deploy [151] Error stopping mvn:org.switchyard.karaf/switchyard-karaf-deploy/2.0.0-SNAPSHOT (org.osgi.framework.BundleException: Activator stop error in bundle org.switchyard.karaf.switchyard-karaf-deploy [151].)
java.lang.IllegalStateException: Service already unregistered.
at org.apache.felix.framework.ServiceRegistrationImpl.unregister(ServiceRegistrationImpl.java:123)
at org.switchyard.deploy.osgi.internal.SwitchYardExtender.doStop(SwitchYardExtender.java:91)
at org.switchyard.deploy.osgi.base.AbstractExtender.stop(AbstractExtender.java:139)
at org.apache.felix.framework.util.SecureAction.stopActivator(SecureAction.java:667)
at org.apache.felix.framework.Felix.stopBundle(Felix.java:2361)
at org.apache.felix.framework.Felix.setActiveStartLevel(Felix.java:1214)
at org.apache.felix.framework.FrameworkStartLevelImpl.run(FrameworkStartLevelImpl.java:295)
at java.lang.Thread.run(Thread.java:662)