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java.lang.NullPointerException: 	at java.io.File.(File.java:222)	at org.jvnet.hudson.plugins.backup.BackupLink.getFileList(BackupLink.java:151)	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)	at java.lang.reflect.Method.invoke(Method.java:597)	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:72)	at org.apache.commons.jelly.tags.core.CoreTagLibrary$3.run(CoreTagLibrary.java:134)	at org.apache.commons.jelly.impl.ScriptBlock.run(ScriptBlock.java:95)	at org.kohsuke.stapler.jelly.CallTagLibScript$1.run(CallTagLibScript.java:75)	at org.apache.commons.jelly.tags.define.InvokeBodyTag.doTag(InvokeBodyTag.java:91)	at org.apache.commons.jelly.impl.TagScript.run(TagScript.java:270)	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:96)	at org.apache.commons.jelly.impl.ScriptBlock.run(ScriptBlock.java:95)	at org.kohsuke.stapler.jelly.CallTagLibScript$1.run(CallTagLibScript.java:75)	at org.apache.commons.jelly.tags.define.InvokeBodyTag.doTag(InvokeBodyTag.java:91)	at org.apache.commons.jelly.impl.TagScript.run(TagScript.java:270)	at org.apache.commons.jelly.impl.ScriptBlock.run(ScriptBlock.java:95)	at org.kohsuke.stapler.jelly.ReallyStaticTagLibrary$1.run(ReallyStaticTagLibrary.java:76)	at org.apache.commons.jelly.impl.ScriptBlock.run(ScriptBlock.java:95)	at org.kohsuke.stapler.jelly.ReallyStaticTagLibrary$1.run(ReallyStaticTagLibrary.java:76)	at org.kohsuke.stapler.jelly.ReallyStaticTagLibrary$1.run(ReallyStaticTagLibrary.java:76)	at org.apache.commons.jelly.impl.ScriptBlock.run(ScriptBlock.java:95)	at org.kohsuke.stapler.jelly.ReallyStaticTagLibrary$1.run(ReallyStaticTagLibrary.java:76)	at org.apache.commons.jelly.impl.ScriptBlock.run(ScriptBlock.java:95)	at org.kohsuke.stapler.jelly.ReallyStaticTagLibrary$1.run(ReallyStaticTagLibrary.java:76)	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:96)	at org.apache.commons.jelly.tags.core.CoreTagLibrary$2.run(CoreTagLibrary.java:105)	at org.kohsuke.stapler.jelly.DefaultScriptInvoker.invokeScript(DefaultScriptInvoker.java:40)	at org.kohsuke.stapler.jelly.DefaultScriptInvoker.invokeScript(DefaultScriptInvoker.java:30)	at org.kohsuke.stapler.jelly.JellyFacet$1.dispatch(JellyFacet.java:59)	at org.kohsuke.stapler.Stapler.invoke(Stapler.java:525)	at org.kohsuke.stapler.MetaClass$12.dispatch(MetaClass.java:319)	at org.kohsuke.stapler.Stapler.invoke(Stapler.java:525)	at org.kohsuke.stapler.Stapler.invoke(Stapler.java:441)	at org.kohsuke.stapler.Stapler.service(Stapler.java:123)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:820)	at org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:487)	at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1093)	at hudson.util.PluginServletFilter$1.doFilter(PluginServletFilter.java:94)	at hudson.util.PluginServletFilter.doFilter(PluginServletFilter.java:86)	at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1084)	at hudson.security.csrf.CrumbFilter.doFilter(CrumbFilter.java:47)	at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1084)	at hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:84)	at hudson.security.ChainedServletFilter.doFilter(ChainedServletFilter.java:76)	at hudson.security.HudsonFilter.doFilter(HudsonFilter.java:164)	at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1084)	at org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:360)	at org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:216)	at org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:181)	at org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:726)	at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:405)	at org.mortbay.jetty.handler.ContextHandlerCollection.handle(ContextHandlerCollection.java:206)	at org.mortbay.jetty.handler.HandlerCollection.handle(HandlerCollection.java:114)	at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:139)	at org.mortbay.jetty.Server.handle(Server.java:324)	at org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:505)	at org.mortbay.jetty.HttpConnection$RequestHandler.headerComplete(HttpConnection.java:828)	at org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:514)	at org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:211)	at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:380)	at org.mortbay.io.nio.SelectChannelEndPoint.run(SelectChannelEndPoint.java:395)	at org.mortbay.thread.BoundedThreadPool$PoolThread.run(BoundedThreadPool.java:450)