java.lang.NullPointerException
 at org.jenkinsci.plugins.pipeline.modeldefinition.agent.DeclarativeAgentDescriptor.instanceForDescriptor(DeclarativeAgentDescriptor.java:153)
 at org.jenkinsci.plugins.pipeline.modeldefinition.agent.DeclarativeAgentDescriptor$instanceForDescriptor$2.call(Unknown Source)
 at org.codehaus.groovy.runtime.callsite.CallSiteArray.defaultCall(CallSiteArray.java:48)
 at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:113)
 at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:133)
 at org.jenkinsci.plugins.pipeline.modeldefinition.model.Agent.getDeclarativeAgent(Agent.groovy:93)
 at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
 at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
 at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
 at java.lang.reflect.Method.invoke(Method.java:498)
 at org.codehaus.groovy.reflection.CachedMethod.invoke(CachedMethod.java:93)
 at groovy.lang.MetaMethod.doMethodInvoke(MetaMethod.java:325)
 at groovy.lang.MetaClassImpl.invokeMethod(MetaClassImpl.java:1213)
 at groovy.lang.MetaClassImpl.invokeMethod(MetaClassImpl.java:1022)
 at org.codehaus.groovy.runtime.callsite.PogoMetaClassSite.call(PogoMetaClassSite.java:42)
 at org.codehaus.groovy.runtime.callsite.CallSiteArray.defaultCall(CallSiteArray.java:48)
 at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:113)
 at com.cloudbees.groovy.cps.sandbox.DefaultInvoker.methodCall(DefaultInvoker.java:20)
 at org.jenkinsci.plugins.pipeline.modeldefinition.ModelInterpreter.inDeclarativeAgent(ModelInterpreter.groovy:589)
 at org.jenkinsci.plugins.pipeline.modeldefinition.ModelInterpreter.call(ModelInterpreter.groovy:76)
 at WorkflowScript.run(WorkflowScript:1)
 at ___cps.transform___(Native Method)
 at com.cloudbees.groovy.cps.impl.ContinuationGroup.methodCall(ContinuationGroup.java:86)
 at com.cloudbees.groovy.cps.impl.FunctionCallBlock$ContinuationImpl.dispatchOrArg(FunctionCallBlock.java:113)
 at com.cloudbees.groovy.cps.impl.FunctionCallBlock$ContinuationImpl.fixArg(FunctionCallBlock.java:83)
 at sun.reflect.GeneratedMethodAccessor113.invoke(Unknown Source)
 at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
 at java.lang.reflect.Method.invoke(Method.java:498)
 at com.cloudbees.groovy.cps.impl.ContinuationPtr$ContinuationImpl.receive(ContinuationPtr.java:72)
 at com.cloudbees.groovy.cps.impl.LocalVariableBlock$LocalVariable.get(LocalVariableBlock.java:39)
 at com.cloudbees.groovy.cps.LValueBlock$GetAdapter.receive(LValueBlock.java:30)
 at com.cloudbees.groovy.cps.impl.LocalVariableBlock.evalLValue(LocalVariableBlock.java:28)
 at com.cloudbees.groovy.cps.LValueBlock$BlockImpl.eval(LValueBlock.java:55)
 at com.cloudbees.groovy.cps.LValueBlock.eval(LValueBlock.java:16)
 at com.cloudbees.groovy.cps.Next.step(Next.java:83)
 at com.cloudbees.groovy.cps.Continuable$1.call(Continuable.java:174)
 at com.cloudbees.groovy.cps.Continuable$1.call(Continuable.java:163)
 at org.codehaus.groovy.runtime.GroovyCategorySupport$ThreadCategoryInfo.use(GroovyCategorySupport.java:129)
 at org.codehaus.groovy.runtime.GroovyCategorySupport.use(GroovyCategorySupport.java:268)
 at com.cloudbees.groovy.cps.Continuable.run0(Continuable.java:163)
 at org.jenkinsci.plugins.workflow.cps.SandboxContinuable.access$001(SandboxContinuable.java:18)
 at org.jenkinsci.plugins.workflow.cps.SandboxContinuable.run0(SandboxContinuable.java:51)
 at org.jenkinsci.plugins.workflow.cps.CpsThread.runNextChunk(CpsThread.java:185)
 at org.jenkinsci.plugins.workflow.cps.CpsThreadGroup.run(CpsThreadGroup.java:400)
 at org.jenkinsci.plugins.workflow.cps.CpsThreadGroup.access$400(CpsThreadGroup.java:96)
 at org.jenkinsci.plugins.workflow.cps.CpsThreadGroup$2.call(CpsThreadGroup.java:312)
 at org.jenkinsci.plugins.workflow.cps.CpsThreadGroup$2.call(CpsThreadGroup.java:276)
 at org.jenkinsci.plugins.workflow.cps.CpsVmExecutorService$2.call(CpsVmExecutorService.java:67)
 at java.util.concurrent.FutureTask.run(FutureTask.java:266)
 at hudson.remoting.SingleLaneExecutorService$1.run(SingleLaneExecutorService.java:139)
 at jenkins.util.ContextResettingExecutorService$1.run(ContextResettingExecutorService.java:28)
 at jenkins.security.ImpersonatingExecutorService$1.run(ImpersonatingExecutorService.java:68)
 at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
 at java.util.concurrent.FutureTask.run(FutureTask.java:266)
 at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
 at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
 at java.lang.Thread.run(Thread.java:748)
Finished: FAILURE