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java.lang.NullPointerException: 	at hudson.scheduler.CronTabList.create(CronTabList.java:104)	at hudson.scheduler.CronTabList.create(CronTabList.java:96)	at hudson.triggers.Trigger.(Trigger.java:166)	at hudson.triggers.SCMTrigger.(SCMTrigger.java:107)	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.jenkinsci.plugins.structs.describable.DescribableModel.instantiate(DescribableModel.java:258)	at org.jenkinsci.plugins.structs.describable.DescribableModel.coerce(DescribableModel.java:372)	at org.jenkinsci.plugins.structs.describable.DescribableModel.coerceList(DescribableModel.java:453)	at org.jenkinsci.plugins.structs.describable.DescribableModel.coerce(DescribableModel.java:357)	at org.jenkinsci.plugins.structs.describable.DescribableModel.buildArguments(DescribableModel.java:313)	at org.jenkinsci.plugins.structs.describable.DescribableModel.instantiate(DescribableModel.java:257)	at org.jenkinsci.plugins.structs.describable.UninstantiatedDescribable.instantiate(UninstantiatedDescribable.java:175)	at org.jenkinsci.plugins.structs.describable.DescribableModel.coerce(DescribableModel.java:364)	at org.jenkinsci.plugins.structs.describable.DescribableModel.coerceList(DescribableModel.java:453)	at org.jenkinsci.plugins.structs.describable.DescribableModel.coerce(DescribableModel.java:357)	at org.jenkinsci.plugins.structs.describable.DescribableModel.buildArguments(DescribableModel.java:313)	at org.jenkinsci.plugins.structs.describable.DescribableModel.instantiate(DescribableModel.java:257)	at org.jenkinsci.plugins.workflow.steps.StepDescriptor.newInstance(StepDescriptor.java:195)	at org.jenkinsci.plugins.workflow.cps.DSL.invokeStep(DSL.java:154)	at org.jenkinsci.plugins.workflow.cps.DSL.invokeMethod(DSL.java:117)	at org.jenkinsci.plugins.workflow.cps.CpsScript.invokeMethod(CpsScript.java:117)	at groovy.lang.GroovyObject$invokeMethod.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.kohsuke.groovy.sandbox.impl.Checker$1.call(Checker.java:151)	at org.kohsuke.groovy.sandbox.GroovyInterceptor.onMethodCall(GroovyInterceptor.java:21)	at org.jenkinsci.plugins.scriptsecurity.sandbox.groovy.SandboxInterceptor.onMethodCall(SandboxInterceptor.java:115)	at org.jenkinsci.plugins.scriptsecurity.sandbox.groovy.SandboxInterceptor.onMethodCall(SandboxInterceptor.java:103)	at org.kohsuke.groovy.sandbox.impl.Checker$1.call(Checker.java:149)	at org.kohsuke.groovy.sandbox.impl.Checker.checkedCall(Checker.java:146)	at com.cloudbees.groovy.cps.sandbox.SandboxInvoker.methodCall(SandboxInvoker.java:15)	at com.cloudbees.groovy.cps.impl.ContinuationGroup.methodCall(ContinuationGroup.java:55)	at com.cloudbees.groovy.cps.impl.FunctionCallBlock$ContinuationImpl.dispatchOrArg(FunctionCallBlock.java:106)	at com.cloudbees.groovy.cps.impl.FunctionCallBlock$ContinuationImpl.fixArg(FunctionCallBlock.java:79)	at sun.reflect.GeneratedMethodAccessor326.invoke(Unknown Source)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)	at java.lang.reflect.Method.invoke(Method.java:498)	at com.cloudbees.groovy.cps.impl.ContinuationPtr$ContinuationImpl.receive(ContinuationPtr.java:72)	at com.cloudbees.groovy.cps.impl.CollectionLiteralBlock$ContinuationImpl.dispatch(CollectionLiteralBlock.java:55)	at com.cloudbees.groovy.cps.impl.CollectionLiteralBlock$ContinuationImpl.item(CollectionLiteralBlock.java:45)	at sun.reflect.GeneratedMethodAccessor337.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$ContinuationImpl.receive(ContinuationPtr.java:72)	at com.cloudbees.groovy.cps.impl.ContinuationGroup.methodCall(ContinuationGroup.java:57)	at com.cloudbees.groovy.cps.impl.FunctionCallBlock$ContinuationImpl.dispatchOrArg(FunctionCallBlock.java:106)	at com.cloudbees.groovy.cps.impl.FunctionCallBlock$ContinuationImpl.fixArg(FunctionCallBlock.java:79)	at sun.reflect.GeneratedMethodAccessor326.invoke(Unknown Source)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)	at java.lang.reflect.Method.invoke(Method.java:498)	at com.cloudbees.groovy.cps.impl.ContinuationPtr$ContinuationImpl.receive(ContinuationPtr.java:72)	at com.cloudbees.groovy.cps.impl.CollectionLiteralBlock$ContinuationImpl.dispatch(CollectionLiteralBlock.java:55)	at com.cloudbees.groovy.cps.impl.CollectionLiteralBlock$ContinuationImpl.item(CollectionLiteralBlock.java:45)	at sun.reflect.GeneratedMethodAccessor337.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$ContinuationImpl.receive(ContinuationPtr.java:72)	at com.cloudbees.groovy.cps.impl.CollectionLiteralBlock$ContinuationImpl.dispatch(CollectionLiteralBlock.java:55)	at com.cloudbees.groovy.cps.impl.CollectionLiteralBlock$ContinuationImpl.item(CollectionLiteralBlock.java:45)	at sun.reflect.GeneratedMethodAccessor337.invoke(Unknown Source)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)	at java.lang.reflect.Method.invoke(Method.java:498)	at com.cloudbees.groovy.cps.impl.ContinuationPtr$ContinuationImpl.receive(ContinuationPtr.java:72)	at com.cloudbees.groovy.cps.impl.ConstantBlock.eval(ConstantBlock.java:21)	at com.cloudbees.groovy.cps.Next.step(Next.java:58)	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:32)	at org.jenkinsci.plugins.workflow.cps.SandboxContinuable$1.call(SandboxContinuable.java:29)	at org.jenkinsci.plugins.scriptsecurity.sandbox.groovy.GroovySandbox.runInSandbox(GroovySandbox.java:108)	at org.jenkinsci.plugins.workflow.cps.SandboxContinuable.run0(SandboxContinuable.java:29)	at org.jenkinsci.plugins.workflow.cps.CpsThread.runNextChunk(CpsThread.java:164)	at org.jenkinsci.plugins.workflow.cps.CpsThreadGroup.run(CpsThreadGroup.java:360)	at org.jenkinsci.plugins.workflow.cps.CpsThreadGroup.access$100(CpsThreadGroup.java:80)	at org.jenkinsci.plugins.workflow.cps.CpsThreadGroup$2.call(CpsThreadGroup.java:236)	at org.jenkinsci.plugins.workflow.cps.CpsThreadGroup$2.call(CpsThreadGroup.java:226)	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)