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java.lang.NullPointerException: 	at org.jenkinsci.plugins.docker.workflow.RegistryEndpointStep$Execution.newKeyMaterialFactory(RegistryEndpointStep.java:61)	at org.jenkinsci.plugins.docker.workflow.AbstractEndpointStepExecution.start(AbstractEndpointStepExecution.java:44)	at org.jenkinsci.plugins.workflow.cps.DSL.invokeMethod(DSL.java:136)	at org.jenkinsci.plugins.workflow.cps.CpsScript.invokeMethod(CpsScript.java:98)	at org.codehaus.groovy.runtime.callsite.PogoMetaClassSite.call(PogoMetaClassSite.java:45)	at org.codehaus.groovy.runtime.callsite.CallSiteArray.defaultCall(CallSiteArray.java:42)	at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:108)	at com.cloudbees.groovy.cps.sandbox.DefaultInvoker.methodCall(DefaultInvoker.java:15)	at WorkflowScript.run(WorkflowScript:4)	at Unknown.Unknown(Unknown)	at ___cps.transform___(Native Method)	at com.cloudbees.groovy.cps.impl.ContinuationGroup.methodCall(ContinuationGroup.java:69)	at com.cloudbees.groovy.cps.impl.FunctionCallBlock$ContinuationImpl.dispatchOrArg(FunctionCallBlock.java:106)	at com.cloudbees.groovy.cps.impl.FunctionCallBlock$ContinuationImpl.fixArg(FunctionCallBlock.java:79)	at sun.reflect.GeneratedMethodAccessor122.invoke(Unknown Source)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)	at java.lang.reflect.Method.invoke(Method.java:497)	at com.cloudbees.groovy.cps.impl.ContinuationPtr$ContinuationImpl.receive(ContinuationPtr.java:72)	at com.cloudbees.groovy.cps.impl.ClosureBlock.eval(ClosureBlock.java:25)	at com.cloudbees.groovy.cps.Next.step(Next.java:58)	at com.cloudbees.groovy.cps.Continuable.run0(Continuable.java:145)	at org.jenkinsci.plugins.workflow.cps.CpsThread.runNextChunk(CpsThread.java:164)	at org.jenkinsci.plugins.workflow.cps.CpsThreadGroup.run(CpsThreadGroup.java:271)	at org.jenkinsci.plugins.workflow.cps.CpsThreadGroup.access$000(CpsThreadGroup.java:71)	at org.jenkinsci.plugins.workflow.cps.CpsThreadGroup$2.call(CpsThreadGroup.java:180)	at org.jenkinsci.plugins.workflow.cps.CpsThreadGroup$2.call(CpsThreadGroup.java:178)	at org.jenkinsci.plugins.workflow.cps.CpsVmExecutorService$2.call(CpsVmExecutorService.java:47)	at java.util.concurrent.FutureTask.run(FutureTask.java:266)	at hudson.remoting.SingleLaneExecutorService$1.run(SingleLaneExecutorService.java:112)	at jenkins.util.ContextResettingExecutorService$1.run(ContextResettingExecutorService.java:28)	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)	at java.util.concurrent.FutureTask.run(FutureTask.java:266)	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)	at java.lang.Thread.run(Thread.java:745)