NamespaceException: alias: '/jolokia' is already in use in this or another context

2018-02-28T13:43:37,929 | ERROR | features-1-thread-1 | osgi | 186 - org.jolokia.osgi - 1.5.0 | Namespace Exception: org.osgi.service.http.NamespaceException: alias: '/jolokia' is already in use in this or another context
 org.osgi.service.http.NamespaceException: alias: '/jolokia' is already in use in this or another context
 at org.ops4j.pax.web.service.spi.model.ServerModel.addServletModel(ServerModel.java:124) ~[?:?]
 at org.ops4j.pax.web.service.internal.HttpServiceStarted.registerServlet(HttpServiceStarted.java:241) ~[?:?]
 at org.ops4j.pax.web.service.internal.HttpServiceStarted.registerServlet(HttpServiceStarted.java:221) ~[?:?]
 at org.ops4j.pax.web.service.internal.HttpServiceStarted.registerServlet(HttpServiceStarted.java:205) ~[?:?]
 at org.ops4j.pax.web.service.internal.HttpServiceProxy.registerServlet(HttpServiceProxy.java:65) ~[?:?]
 at org.jolokia.osgi.JolokiaActivator$HttpServiceCustomizer.addingService(JolokiaActivator.java:315) ~[?:?]
 at org.osgi.util.tracker.ServiceTracker$Tracked.customizerAdding(ServiceTracker.java:941) ~[?:?]
 at org.osgi.util.tracker.ServiceTracker$Tracked.customizerAdding(ServiceTracker.java:870) ~[?:?]
 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:318) ~[?:?]
 at org.osgi.util.tracker.ServiceTracker.open(ServiceTracker.java:261) ~[?:?]
 at org.jolokia.osgi.JolokiaActivator.start(JolokiaActivator.java:102) ~[?:?]
 at org.eclipse.osgi.internal.framework.BundleContextImpl$3.run(BundleContextImpl.java:774) ~[?:?]
 at org.eclipse.osgi.internal.framework.BundleContextImpl$3.run(BundleContextImpl.java:1) ~[?:?]
 at java.security.AccessController.doPrivileged(Native Method) ~[?:?]
 at org.eclipse.osgi.internal.framework.BundleContextImpl.startActivator(BundleContextImpl.java:767) ~[?:?]
 at org.eclipse.osgi.internal.framework.BundleContextImpl.start(BundleContextImpl.java:724) ~[?:?]
 at org.eclipse.osgi.internal.framework.EquinoxBundle.startWorker0(EquinoxBundle.java:932) ~[?:?]
 at org.eclipse.osgi.internal.framework.EquinoxBundle$EquinoxModule.startWorker(EquinoxBundle.java:309) ~[?:?]
 at org.eclipse.osgi.container.Module.doStart(Module.java:581) ~[?:?]
 at org.eclipse.osgi.container.Module.start(Module.java:449) ~[?:?]
 at org.eclipse.osgi.internal.framework.EquinoxBundle.start(EquinoxBundle.java:383) ~[?:?]
 at org.eclipse.osgi.internal.framework.EquinoxBundle.start(EquinoxBundle.java:402) ~[?:?]
 at org.apache.karaf.features.internal.service.FeaturesServiceImpl.startBundle(FeaturesServiceImpl.java:1361) ~[?:?]
 at org.apache.karaf.features.internal.service.Deployer.deploy(Deployer.java:888) ~[?:?]
 at org.apache.karaf.features.internal.service.FeaturesServiceImpl.doProvision(FeaturesServiceImpl.java:1248) ~[?:?]
 at org.apache.karaf.features.internal.service.FeaturesServiceImpl.lambda$doProvisionInThread$1(FeaturesServiceImpl.java:1147) ~[?:?]
 at java.util.concurrent.FutureTask.run(FutureTask.java:266) [?:?]
 at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) [?:?]
 at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) [?:?]
 at java.lang.Thread.run(Thread.java:748) [?:?]