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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)