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io.fabric8.kubernetes.client.KubernetesClientException: An error has occurred.	at io.fabric8.kubernetes.client.KubernetesClientException.launderThrowable(KubernetesClientException.java:53)	at io.fabric8.kubernetes.client.BaseClient.(BaseClient.java:85)	at io.fabric8.kubernetes.client.BaseClient.(BaseClient.java:68)	at io.fabric8.kubernetes.client.BaseClient.(BaseClient.java:64)	at io.fabric8.kubernetes.client.DefaultKubernetesClient.(DefaultKubernetesClient.java:81)	at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)	at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)	at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)	at java.lang.reflect.Constructor.newInstance(Constructor.java:423)	at org.codehaus.groovy.reflection.CachedConstructor.invoke(CachedConstructor.java:77)	at org.codehaus.groovy.runtime.callsite.ConstructorSite$ConstructorSiteNoUnwrapNoCoerce.callConstructor(ConstructorSite.java:102)	at org.codehaus.groovy.runtime.callsite.CallSiteArray.defaultCallConstructor(CallSiteArray.java:54)	at org.codehaus.groovy.runtime.callsite.AbstractCallSite.callConstructor(AbstractCallSite.java:182)	at org.codehaus.groovy.runtime.callsite.AbstractCallSite.callConstructor(AbstractCallSite.java:186)	at io.fabric8.Fabric8Commands.isSingleNode(Fabric8Commands.groovy:431)	at io.fabric8.Fabric8Commands$isSingleNode.call(Unknown Source)	at org.codehaus.groovy.runtime.callsite.CallSiteArray.defaultCall(CallSiteArray.java:42)	at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:108)	at com.cloudbees.groovy.cps.sandbox.DefaultInvoker.methodCall(DefaultInvoker.java:15)