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java.lang.NullPointerException: 	at sun.reflect.UnsafeFieldAccessorImpl.ensureObj(UnsafeFieldAccessorImpl.java:57)	at sun.reflect.UnsafeQualifiedObjectFieldAccessorImpl.get(UnsafeQualifiedObjectFieldAccessorImpl.java:38)	at java.lang.reflect.Field.get(Field.java:393)	at org.jenkinsci.plugins.workflow.cps.CpsFlowExecution.cleanUpGlobalClassSet(CpsFlowExecution.java:1034)	at org.jenkinsci.plugins.workflow.cps.CpsFlowExecution.cleanUpLoader(CpsFlowExecution.java:966)	at org.jenkinsci.plugins.workflow.cps.CpsFlowExecution.cleanUpLoader(CpsFlowExecution.java:968)	at org.jenkinsci.plugins.workflow.cps.CpsFlowExecution.cleanUpLoader(CpsFlowExecution.java:968)	at org.jenkinsci.plugins.workflow.cps.CpsFlowExecution.cleanUpLoader(CpsFlowExecution.java:957)	at org.jenkinsci.plugins.workflow.cps.CpsFlowExecution.cleanUpLoader(CpsFlowExecution.java:957)	at org.jenkinsci.plugins.workflow.cps.CpsFlowExecution.cleanUpHeap(CpsFlowExecution.java:941)	at org.jenkinsci.plugins.workflow.cps.CpsThreadGroup.run(CpsThreadGroup.java:363)	at org.jenkinsci.plugins.workflow.cps.CpsThreadGroup.access$100(CpsThreadGroup.java:80)	at org.jenkinsci.plugins.workflow.cps.CpsThreadGroup$2.call(CpsThreadGroup.java:240)	at org.jenkinsci.plugins.workflow.cps.CpsThreadGroup$2.call(CpsThreadGroup.java:228)	at org.jenkinsci.plugins.workflow.cps.CpsVmExecutorService$2.call(CpsVmExecutorService.java:63)	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)