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java.lang.NullPointerException: 	at com.cloudbees.plugins.credentials.matchers.IdMatcher.(IdMatcher.java:49)	at com.cloudbees.plugins.credentials.CredentialsMatchers.withId(CredentialsMatchers.java:112)	at org.jfrog.hudson.util.plugins.PluginsUtils.credentialsLookup(PluginsUtils.java:61)	at org.jfrog.hudson.CredentialsConfig.provideUsername(CredentialsConfig.java:68)	at org.jfrog.hudson.pipeline.executors.GenericDownloadExecutor.downloadArtifacts(GenericDownloadExecutor.java:69)	at org.jfrog.hudson.pipeline.executors.GenericDownloadExecutor.execution(GenericDownloadExecutor.java:52)	at org.jfrog.hudson.pipeline.steps.DownloadStep$Execution.run(DownloadStep.java:60)	at org.jfrog.hudson.pipeline.steps.DownloadStep$Execution.run(DownloadStep.java:44)	at org.jenkinsci.plugins.workflow.steps.AbstractSynchronousStepExecution.start(AbstractSynchronousStepExecution.java:40)	at org.jenkinsci.plugins.workflow.cps.DSL.invokeMethod(DSL.java:137)	at org.jenkinsci.plugins.workflow.cps.CpsScript.invokeMethod(CpsScript.java:113)	at org.jfrog.hudson.pipeline.types.ArtifactoryServer.download(ArtifactoryServer.java:64)	at org.jfrog.hudson.pipeline.types.ArtifactoryServer$download.call(Unknown Source)	at org.codehaus.groovy.runtime.callsite.CallSiteArray.defaultCall(CallSiteArray.java:42)	at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:108)	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.kohsuke.groovy.sandbox.impl.Checker$1.call(Checker.java:149)	at org.kohsuke.groovy.sandbox.impl.Checker.checkedCall(Checker.java:146)	at com.cloudbees.groovy.cps.sandbox.SandboxInvoker.methodCall(SandboxInvoker.java:15)	at undefined.WorkflowScript.run(WorkflowScript:12)	at undefined.___cps.transform___(Native Method)	at com.cloudbees.groovy.cps.impl.ContinuationGroup.methodCall(ContinuationGroup.java:55)	at com.cloudbees.groovy.cps.impl.FunctionCallBlock$ContinuationImpl.dispatchOrArg(FunctionCallBlock.java:106)	at com.cloudbees.groovy.cps.impl.FunctionCallBlock$ContinuationImpl.fixArg(FunctionCallBlock.java:79)	at sun.reflect.GeneratedMethodAccessor173.invoke(Unknown Source)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)	at java.lang.reflect.Method.invoke(Method.java:498)	at com.cloudbees.groovy.cps.impl.ContinuationPtr$ContinuationImpl.receive(ContinuationPtr.java:72)	at com.cloudbees.groovy.cps.impl.LocalVariableBlock$LocalVariable.get(LocalVariableBlock.java:33)	at com.cloudbees.groovy.cps.LValueBlock$GetAdapter.receive(LValueBlock.java:30)	at com.cloudbees.groovy.cps.impl.LocalVariableBlock.evalLValue(LocalVariableBlock.java:22)	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:58)	at com.cloudbees.groovy.cps.Continuable.run0(Continuable.java:154)	at org.jenkinsci.plugins.workflow.cps.SandboxContinuable.access$001(SandboxContinuable.java:19)	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:164)	at org.jenkinsci.plugins.workflow.cps.CpsThreadGroup.run(CpsThreadGroup.java:276)	at org.jenkinsci.plugins.workflow.cps.CpsThreadGroup.access$000(CpsThreadGroup.java:78)	at org.jenkinsci.plugins.workflow.cps.CpsThreadGroup$2.call(CpsThreadGroup.java:185)	at org.jenkinsci.plugins.workflow.cps.CpsThreadGroup$2.call(CpsThreadGroup.java:183)	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)