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java.lang.NullPointerException: 	at hudson.plugins.jira.JiraSite.get(JiraSite.java:254)	at hudson.plugins.jira.listissuesparameter.JiraIssueParameterDefinition.getIssues(JiraIssueParameterDefinition.java:73)	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)	at java.lang.reflect.Method.invoke(Unknown Source)	at org.apache.commons.jexl.util.PropertyExecutor.execute(PropertyExecutor.java:125)	at org.apache.commons.jexl.util.introspection.UberspectImpl$VelGetterImpl.invoke(UberspectImpl.java:314)	at org.apache.commons.jexl.parser.ASTArrayAccess.evaluateExpr(ASTArrayAccess.java:185)	at org.apache.commons.jexl.parser.ASTIdentifier.execute(ASTIdentifier.java:75)	at org.apache.commons.jexl.parser.ASTReference.execute(ASTReference.java:83)	at org.apache.commons.jexl.parser.ASTReference.value(ASTReference.java:57)	at org.apache.commons.jexl.parser.ASTReferenceExpression.value(ASTReferenceExpression.java:51)	at org.apache.commons.jexl.ExpressionImpl.evaluate(ExpressionImpl.java:80)	at hudson.ExpressionFactory2$JexlExpression.evaluate(ExpressionFactory2.java:74)	at org.apache.commons.jelly.expression.ExpressionSupport.evaluateRecurse(ExpressionSupport.java:61)	at org.apache.commons.jelly.expression.ExpressionSupport.evaluateAsIterator(ExpressionSupport.java:94)	at org.apache.commons.jelly.tags.core.ForEachTag.doTag(ForEachTag.java:89)	at org.apache.commons.jelly.impl.TagScript.run(TagScript.java:269)	at org.kohsuke.stapler.jelly.ReallyStaticTagLibrary$1.run(ReallyStaticTagLibrary.java:99)	at org.apache.commons.jelly.TagSupport.invokeBody(TagSupport.java:161)	at org.apache.commons.jelly.tags.core.OtherwiseTag.doTag(OtherwiseTag.java:41)	at org.apache.commons.jelly.impl.TagScript.run(TagScript.java:269)	at org.apache.commons.jelly.impl.ScriptBlock.run(ScriptBlock.java:95)	at org.apache.commons.jelly.TagSupport.invokeBody(TagSupport.java:161)	at org.apache.commons.jelly.tags.core.ChooseTag.doTag(ChooseTag.java:38)	at org.apache.commons.jelly.impl.TagScript.run(TagScript.java:269)	at org.apache.commons.jelly.impl.ScriptBlock.run(ScriptBlock.java:95)	at org.kohsuke.stapler.jelly.ReallyStaticTagLibrary$1.run(ReallyStaticTagLibrary.java:99)	at org.kohsuke.stapler.jelly.CallTagLibScript$1.run(CallTagLibScript.java:99)	at org.apache.commons.jelly.tags.define.InvokeBodyTag.doTag(InvokeBodyTag.java:91)	at org.apache.commons.jelly.impl.TagScript.run(TagScript.java:269)	at org.kohsuke.stapler.jelly.ReallyStaticTagLibrary$1.run(ReallyStaticTagLibrary.java:99)	at org.apache.commons.jelly.impl.ScriptBlock.run(ScriptBlock.java:95)	at org.kohsuke.stapler.jelly.ReallyStaticTagLibrary$1.run(ReallyStaticTagLibrary.java:99)	at org.apache.commons.jelly.impl.ScriptBlock.run(ScriptBlock.java:95)	at org.apache.commons.jelly.tags.core.CoreTagLibrary$2.run(CoreTagLibrary.java:105)	at org.kohsuke.stapler.jelly.CallTagLibScript.run(CallTagLibScript.java:120)	at org.apache.commons.jelly.tags.core.CoreTagLibrary$2.run(CoreTagLibrary.java:105)	at org.kohsuke.stapler.jelly.JellyViewScript.run(JellyViewScript.java:95)	at org.kohsuke.stapler.jelly.IncludeTag.doTag(IncludeTag.java:147)	at org.apache.commons.jelly.impl.TagScript.run(TagScript.java:269)	at org.kohsuke.stapler.jelly.ReallyStaticTagLibrary$1.run(ReallyStaticTagLibrary.java:99)	at org.apache.commons.jelly.TagSupport.invokeBody(TagSupport.java:161)	at org.apache.commons.jelly.tags.core.ForEachTag.doTag(ForEachTag.java:150)	at org.apache.commons.jelly.impl.TagScript.run(TagScript.java:269)	at org.apache.commons.jelly.impl.ScriptBlock.run(ScriptBlock.java:95)	at org.kohsuke.stapler.jelly.CallTagLibScript$1.run(CallTagLibScript.java:99)	at org.apache.commons.jelly.tags.define.InvokeBodyTag.doTag(InvokeBodyTag.java:91)	at org.apache.commons.jelly.impl.TagScript.run(TagScript.java:269)	at org.kohsuke.stapler.jelly.ReallyStaticTagLibrary$1.run(ReallyStaticTagLibrary.java:99)	at org.kohsuke.stapler.jelly.ReallyStaticTagLibrary$1.run(ReallyStaticTagLibrary.java:99)	at org.apache.commons.jelly.impl.ScriptBlock.run(ScriptBlock.java:95)	at org.apache.commons.jelly.tags.core.CoreTagLibrary$2.run(CoreTagLibrary.java:105)	at org.kohsuke.stapler.jelly.CallTagLibScript.run(CallTagLibScript.java:120)	at org.apache.commons.jelly.impl.ScriptBlock.run(ScriptBlock.java:95)	at org.kohsuke.stapler.jelly.CallTagLibScript$1.run(CallTagLibScript.java:99)	at org.apache.commons.jelly.tags.define.InvokeBodyTag.doTag(InvokeBodyTag.java:91)	at org.apache.commons.jelly.impl.TagScript.run(TagScript.java:269)	at org.apache.commons.jelly.impl.ScriptBlock.run(ScriptBlock.java:95)	at org.apache.commons.jelly.tags.core.CoreTagLibrary$1.run(CoreTagLibrary.java:98)	at org.apache.commons.jelly.impl.ScriptBlock.run(ScriptBlock.java:95)	at org.apache.commons.jelly.tags.core.CoreTagLibrary$2.run(CoreTagLibrary.java:105)	at org.kohsuke.stapler.jelly.CallTagLibScript.run(CallTagLibScript.java:120)	at org.apache.commons.jelly.impl.ScriptBlock.run(ScriptBlock.java:95)	at org.kohsuke.stapler.jelly.CallTagLibScript$1.run(CallTagLibScript.java:99)	at org.apache.commons.jelly.tags.define.InvokeBodyTag.doTag(InvokeBodyTag.java:91)	at org.apache.commons.jelly.impl.TagScript.run(TagScript.java:269)	at org.apache.commons.jelly.impl.ScriptBlock.run(ScriptBlock.java:95)	at org.kohsuke.stapler.jelly.ReallyStaticTagLibrary$1.run(ReallyStaticTagLibrary.java:99)	at org.kohsuke.stapler.jelly.ReallyStaticTagLibrary$1.run(ReallyStaticTagLibrary.java:99)	at org.apache.commons.jelly.impl.ScriptBlock.run(ScriptBlock.java:95)	at org.kohsuke.stapler.jelly.ReallyStaticTagLibrary$1.run(ReallyStaticTagLibrary.java:99)	at org.kohsuke.stapler.jelly.ReallyStaticTagLibrary$1.run(ReallyStaticTagLibrary.java:99)	at org.apache.commons.jelly.impl.ScriptBlock.run(ScriptBlock.java:95)	at org.kohsuke.stapler.jelly.ReallyStaticTagLibrary$1.run(ReallyStaticTagLibrary.java:99)	at org.apache.commons.jelly.impl.ScriptBlock.run(ScriptBlock.java:95)	at org.kohsuke.stapler.jelly.ReallyStaticTagLibrary$1.run(ReallyStaticTagLibrary.java:99)	at org.apache.commons.jelly.impl.ScriptBlock.run(ScriptBlock.java:95)	at org.apache.commons.jelly.tags.core.CoreTagLibrary$2.run(CoreTagLibrary.java:105)	at org.kohsuke.stapler.jelly.CallTagLibScript.run(CallTagLibScript.java:120)	at org.apache.commons.jelly.impl.ScriptBlock.run(ScriptBlock.java:95)	at org.apache.commons.jelly.tags.core.CoreTagLibrary$2.run(CoreTagLibrary.java:105)	at org.kohsuke.stapler.jelly.JellyViewScript.run(JellyViewScript.java:95)	at org.kohsuke.stapler.jelly.DefaultScriptInvoker.invokeScript(DefaultScriptInvoker.java:63)	at org.kohsuke.stapler.jelly.DefaultScriptInvoker.invokeScript(DefaultScriptInvoker.java:53)	at org.kohsuke.stapler.jelly.JellyRequestDispatcher.forward(JellyRequestDispatcher.java:55)	at jenkins.model.ParameterizedJobMixIn.doBuild(ParameterizedJobMixIn.java:162)	at org.jenkinsci.plugins.workflow.job.WorkflowJob.doBuild(WorkflowJob.java:241)	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)	at java.lang.reflect.Method.invoke(Unknown Source)	at org.kohsuke.stapler.Function$InstanceFunction.invoke(Function.java:298)	at org.kohsuke.stapler.Function.bindAndInvoke(Function.java:161)	at org.kohsuke.stapler.Function.bindAndInvokeAndServeResponse(Function.java:96)	at org.kohsuke.stapler.MetaClass$1.doDispatch(MetaClass.java:121)	at org.kohsuke.stapler.NameBasedDispatcher.dispatch(NameBasedDispatcher.java:53)	at org.kohsuke.stapler.Stapler.tryInvoke(Stapler.java:746)	at org.kohsuke.stapler.Stapler.invoke(Stapler.java:876)	at org.kohsuke.stapler.MetaClass$6.doDispatch(MetaClass.java:249)	at org.kohsuke.stapler.NameBasedDispatcher.dispatch(NameBasedDispatcher.java:53)	at org.kohsuke.stapler.Stapler.tryInvoke(Stapler.java:746)	at org.kohsuke.stapler.Stapler.invoke(Stapler.java:876)	at org.kohsuke.stapler.Stapler.invoke(Stapler.java:649)	at org.kohsuke.stapler.Stapler.service(Stapler.java:238)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:848)	at org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:686)	at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1494)	at hudson.util.PluginServletFilter$1.doFilter(PluginServletFilter.java:123)	at hudson.util.PluginServletFilter.doFilter(PluginServletFilter.java:114)	at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1482)	at hudson.security.csrf.CrumbFilter.doFilter(CrumbFilter.java:48)	at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1482)	at hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:84)	at hudson.security.ChainedServletFilter.doFilter(ChainedServletFilter.java:76)	at hudson.security.HudsonFilter.doFilter(HudsonFilter.java:171)	at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1482)	at org.kohsuke.stapler.compression.CompressionFilter.doFilter(CompressionFilter.java:49)	at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1482)	at hudson.util.CharacterEncodingFilter.doFilter(CharacterEncodingFilter.java:81)	at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1482)	at org.kohsuke.stapler.DiagnosticThreadNameFilter.doFilter(DiagnosticThreadNameFilter.java:30)	at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1474)	at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:499)	at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:137)	at org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:533)	at org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:231)	at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1086)	at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:428)	at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:193)	at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1020)	at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:135)	at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:116)	at org.eclipse.jetty.server.Server.handle(Server.java:370)	at org.eclipse.jetty.server.AbstractHttpConnection.handleRequest(AbstractHttpConnection.java:489)	at org.eclipse.jetty.server.AbstractHttpConnection.headerComplete(AbstractHttpConnection.java:949)	at org.eclipse.jetty.server.AbstractHttpConnection$RequestHandler.headerComplete(AbstractHttpConnection.java:1011)	at org.eclipse.jetty.http.HttpParser.parseNext(HttpParser.java:644)	at org.eclipse.jetty.http.HttpParser.parseAvailable(HttpParser.java:235)	at org.eclipse.jetty.server.AsyncHttpConnection.handle(AsyncHttpConnection.java:82)	at org.eclipse.jetty.io.nio.SelectChannelEndPoint.handle(SelectChannelEndPoint.java:668)	at org.eclipse.jetty.io.nio.SelectChannelEndPoint$1.run(SelectChannelEndPoint.java:52)	at winstone.BoundedExecutorService$1.run(BoundedExecutorService.java:77)	at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)	at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)	at java.lang.Thread.run(Unknown Source)