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java.lang.NullPointerException: 	at org.apache.ode.utils.xsl.XslTransformHandler.parseXSLSheet(XslTransformHandler.java:84)	at org.apache.ode.utils.xsl.XslTransformHandler.cacheXSLSheet(XslTransformHandler.java:106)	at org.apache.ode.bpel.elang.xpath10.runtime.JaxenContexts$DoXslTransformFunction.call(JaxenContexts.java:367)	at org.jaxen.expr.DefaultFunctionCallExpr.evaluate(DefaultFunctionCallExpr.java:186)	at org.jaxen.expr.DefaultXPathExpr.asList(DefaultXPathExpr.java:112)	at org.jaxen.BaseXPath.selectNodesForContext(BaseXPath.java:688)	at org.jaxen.BaseXPath.selectNodes(BaseXPath.java:227)	at org.apache.ode.bpel.elang.xpath10.runtime.XPath10ExpressionRuntime.evaluate(XPath10ExpressionRuntime.java:98)	at org.apache.ode.bpel.runtime.ExpressionLanguageRuntimeRegistry.evaluate(ExpressionLanguageRuntimeRegistry.java:80)	at org.apache.ode.bpel.runtime.ASSIGN.evalRValue(ASSIGN.java:196)	at org.apache.ode.bpel.runtime.ASSIGN.copy(ASSIGN.java:362)	at org.apache.ode.bpel.runtime.ASSIGN.run(ASSIGN.java:79)	at sun.reflect.GeneratedMethodAccessor52.invoke(Unknown Source)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)	at java.lang.reflect.Method.invoke(Method.java:585)	at org.apache.ode.jacob.vpu.JacobVPU$JacobThreadImpl.run(JacobVPU.java:451)	at org.apache.ode.jacob.vpu.JacobVPU.execute(JacobVPU.java:139)	at org.apache.ode.bpel.engine.BpelRuntimeContextImpl.execute(BpelRuntimeContextImpl.java:913)	at org.apache.ode.bpel.engine.BpelProcess.handleWorkEvent(BpelProcess.java:392)	at org.apache.ode.bpel.engine.BpelEngineImpl.onScheduledJob(BpelEngineImpl.java:328)	at org.apache.ode.bpel.engine.BpelServerImpl.onScheduledJob(BpelServerImpl.java:373)	at org.apache.ode.scheduler.simple.SimpleScheduler$4$1.call(SimpleScheduler.java:341)	at org.apache.ode.scheduler.simple.SimpleScheduler$4$1.call(SimpleScheduler.java:340)	at org.apache.ode.scheduler.simple.SimpleScheduler.execTransaction(SimpleScheduler.java:179)	at org.apache.ode.scheduler.simple.SimpleScheduler$4.call(SimpleScheduler.java:339)	at org.apache.ode.scheduler.simple.SimpleScheduler$4.call(SimpleScheduler.java:336)	at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:269)	at java.util.concurrent.FutureTask.run(FutureTask.java:123)	at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:650)	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:675)	at java.lang.Thread.run(Thread.java:613)