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java.lang.NullPointerException: null	at org.cf.smalivm.context.Heap.cloneItem(Heap.java:187)	at org.cf.smalivm.context.Heap.get(Heap.java:69)	at org.cf.smalivm.context.Heap.get(Heap.java:89)	at org.cf.smalivm.context.BaseState.peekRegister(BaseState.java:90)	at org.cf.smalivm.context.BaseState.readRegister(BaseState.java:111)	at org.cf.smalivm.context.MethodState.readRegister(MethodState.java:184)	at org.cf.smalivm.opcode.ThrowOp.execute(ThrowOp.java:25)	at org.cf.smalivm.context.ExecutionNode.execute(ExecutionNode.java:50)	at org.cf.smalivm.NodeExecutor.execute(NodeExecutor.java:77)	at org.cf.smalivm.MethodExecutor.execute(MethodExecutor.java:62)	at org.cf.smalivm.VirtualMachine.execute(VirtualMachine.java:131)	at org.cf.smalivm.VirtualMachine.execute(VirtualMachine.java:109)	at org.cf.smalivm.opcode.InvokeOp.executeLocalMethod(InvokeOp.java:335)	at org.cf.smalivm.opcode.InvokeOp.execute(InvokeOp.java:136)	at org.cf.smalivm.context.ExecutionNode.execute(ExecutionNode.java:52)	at org.cf.smalivm.NodeExecutor.execute(NodeExecutor.java:77)	at org.cf.smalivm.MethodExecutor.execute(MethodExecutor.java:62)	at org.cf.smalivm.VirtualMachine.execute(VirtualMachine.java:131)	at org.cf.smalivm.VirtualMachine.execute(VirtualMachine.java:109)	at org.cf.smalivm.opcode.InvokeOp.executeLocalMethod(InvokeOp.java:335)	at org.cf.smalivm.opcode.InvokeOp.execute(InvokeOp.java:136)	at org.cf.smalivm.context.ExecutionNode.execute(ExecutionNode.java:52)	at org.cf.smalivm.NodeExecutor.execute(NodeExecutor.java:77)	at org.cf.smalivm.MethodExecutor.execute(MethodExecutor.java:62)	at org.cf.smalivm.VirtualMachine.execute(VirtualMachine.java:131)	at org.cf.smalivm.VirtualMachine.execute(VirtualMachine.java:89)	at org.cf.simplify.Launcher.executeClass(Launcher.java:191)	at org.cf.simplify.Launcher.run(Launcher.java:153)	at org.cf.simplify.Main.main(Main.java:14)