simulate_add_mul.py works okays
d_instance
<myhdl._always._Always object at 0x2062890>
<class 'myhdl._always._Always'>

mult_sim.py gets the following error
t
<myhdl._always._Always object at 0xc9e490> <class 'myhdl._always._Always'>

This is the error
  File "mult_sig.py", line 223, in <module>
    tb_fsm = traceSignals(testbench)
  File "/home/vidal/lib/python/myhdl/_traceSignals.py", line 82, in __call__
    h = _HierExtr(name, dut, *args, **kwargs)
  File "/home/vidal/lib/python/myhdl/_extractHierarchy.py", line 253, in __init__
    raise ExtractHierarchyError(_error.InconsistentToplevel % (top_inst.level, name))
myhdl.ExtractHierarchyError: Inconsistent top level 2 for testbench - should be 1