node {
  def env = "HEAD";
  puppet.codeDeploy env;
}

com.google.gson.JsonSyntaxException: java.lang.IllegalStateException: Expected BEGIN_ARRAY but was BEGIN_OBJECT at line 1 column 2 path $
  at com.google.gson.Gson.fromJson(Gson.java:899)
  at com.google.gson.Gson.fromJson(Gson.java:852)
  at com.google.gson.Gson.fromJson(Gson.java:801)
  at org.jenkinsci.plugins.puppetenterprise.apimanagers.puppetcodemanagerv1.CodeManagerDeploysV1.execute(CodeManagerDeploysV1.java:52)
  at org.jenkinsci.plugins.puppetenterprise.models.PuppetCodeManager.deploy(PuppetCodeManager.java:51)
  at org.jenkinsci.plugins.workflow.steps.CodeDeployStep$CodeDeployStepExecution.run(CodeDeployStep.java:90)
  at org.jenkinsci.plugins.workflow.steps.CodeDeployStep$CodeDeployStepExecution.run(CodeDeployStep.java:64)
  at org.jenkinsci.plugins.workflow.steps.AbstractSynchronousStepExecution.start(AbstractSynchronousStepExecution.java:42)
  at org.jenkinsci.plugins.workflow.cps.DSL.invokeStep(DSL.java:184)
  at org.jenkinsci.plugins.workflow.cps.DSL.invokeMethod(DSL.java:126)
  at org.jenkinsci.plugins.workflow.cps.CpsScript.invokeMethod(CpsScript.java:108)
  at org.codehaus.groovy.runtime.callsite.PogoMetaClassSite.call(PogoMetaClassSite.java:48)
  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:18)
  at org.jenkinsci.plugins.workflow.Puppet.codeDeploy(jar:file:/var/lib/jenkins/plugins/puppet-enterprise-pipeline/WEB-INF/lib/puppet-enterprise-pipeline.jar!/org/jenkinsci/plugins/workflow/Puppet.groovy:49)
  at org.jenkinsci.plugins.workflow.Puppet.node(jar:file:/var/lib/jenkins/plugins/puppet-enterprise-pipeline/WEB-INF/lib/puppet-enterprise-pipeline.jar!/org/jenkinsci/plugins/workflow/Puppet.groovy:128)
  at org.jenkinsci.plugins.workflow.Puppet.codeDeploy(jar:file:/var/lib/jenkins/plugins/puppet-enterprise-pipeline/WEB-INF/lib/puppet-enterprise-pipeline.jar!/org/jenkinsci/plugins/workflow/Puppet.groovy:38)
  at WorkflowScript.run(WorkflowScript:59)
  at ___cps.transform___(Native Method)
  at com.cloudbees.groovy.cps.impl.ContinuationGroup.methodCall(ContinuationGroup.java:57)
  at com.cloudbees.groovy.cps.impl.FunctionCallBlock$ContinuationImpl.dispatchOrArg(FunctionCallBlock.java:109)
  at com.cloudbees.groovy.cps.impl.FunctionCallBlock$ContinuationImpl.fixArg(FunctionCallBlock.java:82)
  at sun.reflect.GeneratedMethodAccessor183.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$ContinuationImpl.receive(ContinuationPtr.java:72)
  at com.cloudbees.groovy.cps.impl.CollectionLiteralBlock$ContinuationImpl.dispatch(CollectionLiteralBlock.java:55)
  at com.cloudbees.groovy.cps.impl.CollectionLiteralBlock$ContinuationImpl.item(CollectionLiteralBlock.java:45)
  at sun.reflect.GeneratedMethodAccessor217.invoke(Unknown Source)
  at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
  at java.lang.reflect.Method.invoke(Method.java:497)
  at com.cloudbees.groovy.cps.impl.ContinuationPtr$ContinuationImpl.receive(ContinuationPtr.java:72)
  at com.cloudbees.groovy.cps.impl.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:74)
  at com.cloudbees.groovy.cps.Continuable.run0(Continuable.java:154)
  at org.jenkinsci.plugins.workflow.cps.SandboxContinuable.access$001(SandboxContinuable.java:18)
  at org.jenkinsci.plugins.workflow.cps.SandboxContinuable$1.call(SandboxContinuable.java:33)
  at org.jenkinsci.plugins.workflow.cps.SandboxContinuable$1.call(SandboxContinuable.java:30)
  at org.jenkinsci.plugins.scriptsecurity.sandbox.groovy.GroovySandbox.runInSandbox(GroovySandbox.java:108)
  at org.jenkinsci.plugins.workflow.cps.SandboxContinuable.run0(SandboxContinuable.java:30)
  at org.jenkinsci.plugins.workflow.cps.CpsThread.runNextChunk(CpsThread.java:165)
  at org.jenkinsci.plugins.workflow.cps.CpsThreadGroup.run(CpsThreadGroup.java:328)
  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:64)
  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)
Caused by: java.lang.IllegalStateException: Expected BEGIN_ARRAY but was BEGIN_OBJECT at line 1 column 2 path $
  at com.google.gson.stream.JsonReader.beginArray(JsonReader.java:350)
  at com.google.gson.internal.bind.CollectionTypeAdapterFactory$Adapter.read(CollectionTypeAdapterFactory.java:80)
  at com.google.gson.internal.bind.CollectionTypeAdapterFactory$Adapter.read(CollectionTypeAdapterFactory.java:61)
  at com.google.gson.Gson.fromJson(Gson.java:887)
  at com.google.gson.Gson.fromJson(Gson.java:852)
  at com.google.gson.Gson.fromJson(Gson.java:801)
  at org.jenkinsci.plugins.puppetenterprise.apimanagers.puppetcodemanagerv1.CodeManagerDeploysV1.execute(CodeManagerDeploysV1.java:52)
  at org.jenkinsci.plugins.puppetenterprise.models.PuppetCodeManager.deploy(PuppetCodeManager.java:51)
  at org.jenkinsci.plugins.workflow.steps.CodeDeployStep$CodeDeployStepExecution.run(CodeDeployStep.java:90)
  at org.jenkinsci.plugins.workflow.steps.CodeDeployStep$CodeDeployStepExecution.run(CodeDeployStep.java:64)
  at org.jenkinsci.plugins.workflow.steps.AbstractSynchronousStepExecution.start(AbstractSynchronousStepExecution.java:42)
  at org.jenkinsci.plugins.workflow.cps.DSL.invokeStep(DSL.java:184)
  at org.jenkinsci.plugins.workflow.cps.DSL.invokeMethod(DSL.java:126)
  at org.jenkinsci.plugins.workflow.cps.CpsScript.invokeMethod(CpsScript.java:108)
  at org.codehaus.groovy.runtime.callsite.PogoMetaClassSite.call(PogoMetaClassSite.java:48)
  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:18)
  ... 39 more
Finished: FAILURE