javax.el.* API conflict in AS 5

10:38:46,920 ERROR [STDERR] Caused by: java.lang.NoSuchMethodError: javax.el.ExpressionFactory.newInstance()Ljavax/el/ExpressionFactory;
10:38:46,920 ERROR [STDERR] at com.sun.script.juel.JuelScriptEngine.<init>(JuelScriptEngine.java:95)
10:38:46,920 ERROR [STDERR] at com.sun.script.juel.JuelScriptEngineFactory.getScriptEngine(JuelScriptEngineFactory.java:241)
10:38:46,920 ERROR [STDERR] at javax.script.ScriptEngineManager.getEngineByName(ScriptEngineManager.java:133)
10:38:46,920 ERROR [STDERR] at org.jbpm.pvm.internal.script.ScriptManager.evaluate(ScriptManager.java:103)
10:38:46,920 ERROR [STDERR] at org.jbpm.pvm.internal.script.ScriptManager.evaluateExpression(ScriptManager.java:82)
10:38:46,921 ERROR [STDERR] at org.jbpm.jpdl.internal.model.JpdlExecution.resolveAssignmentExpression(JpdlExecution.java:142)
10:38:46,921 ERROR [STDERR] at org.jbpm.jpdl.internal.model.JpdlExecution.initializeAssignments(JpdlExecution.java:129)
10:38:46,921 ERROR [STDERR] at org.jbpm.jpdl.internal.model.JpdlExecution.initializeTask(JpdlExecution.java:84)
10:38:46,921 ERROR [STDERR] at org.jbpm.jpdl.internal.activity.TaskActivity.execute(TaskActivity.java:54)
10:38:46,921 ERROR [STDERR] at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
10:38:46,921 ERROR [STDERR] at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
10:38:46,921 ERROR [STDERR] at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
10:38:46,921 ERROR [STDERR] at java.lang.reflect.Method.invoke(Method.java:585)
10:38:46,921 ERROR [STDERR] at org.hibernate.proxy.pojo.javassist.JavassistLazyInitializer.invoke(JavassistLazyInitializer.java:197)
10:38:46,921 ERROR [STDERR] at org.jbpm.jpdl.internal.activity.TaskActivity_$$javassist_41.execute(TaskActivity$$_javassist_41.java)
10:38:46,921 ERROR [STDERR] at org.jbpm.pvm.internal.model.op.ExecuteActivity.perform(ExecuteActivity.java:57)
10:38:46,922 ERROR [STDERR] at org.jbpm.pvm.internal.model.ExecutionImpl.performAtomicOperationSync(ExecutionImpl.java:588)
10:38:46,922 ERROR [STDERR] at org.jbpm.pvm.internal.model.ExecutionImpl.performAtomicOperation(ExecutionImpl.java:561)
10:38:46,922 ERROR [STDERR] at org.jbpm.pvm.internal.model.ExecutionImpl.start(ExecutionImpl.java:199)
10:38:46,922 ERROR [STDERR] at org.jbpm.pvm.internal.cmd.StartExecutionCmd.execute(StartExecutionCmd.java:61)
10:38:46,922 ERROR [STDERR] at org.jbpm.pvm.internal.cmd.StartExecutionCmd.execute(StartExecutionCmd.java:36)
10:38:46,922 ERROR [STDERR] at org.jbpm.pvm.internal.svc.DefaultCommandService.execute(DefaultCommandService.java:42)
10:38:46,922 ERROR [STDERR] at org.jbpm.pvm.internal.svc.EnvironmentInterceptor.execute(EnvironmentInterceptor.java:54)
10:38:46,922 ERROR [STDERR] at org.jbpm.pvm.internal.svc.RetryInterceptor.execute(RetryInterceptor.java:52)
10:38:46,922 ERROR [STDERR] at org.jbpm.pvm.internal.svc.ExecutionServiceImpl.startProcessInstanceById(ExecutionServiceImpl.java:51)
10:38:46,922 ERROR [STDERR] at org.jbpm.integration.console.ProcessManagem