#12 using measurement.py start(blocking = False) gives error

[Chunqing]

to reproduce:
inst = qt.instruments.create('inst', 'example', address = 'GPIB::0')
m1 = measurement.Measurement('meas_6')
m1.add_coordinate(inst, 'chA_output', 0, 10, steps = 100, delay = 1)
m1.add_coordinate(inst, 'chB_output', 10, 20, steps = 100, delay = 1)
m1.add_measurement(inst, 'value1')
m1.start(blocking = False)

The above code gives err:
IndexError: list index out of range
Error: 1 parameteres needed for signal finished; 0 given
Exception in thread Thread-2:
Traceback (most recent call last):
File "c:\python26\lib\therading.py", line 532, in __bootstrap_inner
self.run()
File "C:\qtlab\source\lib\calltimer.py", line 130, in run
raise e
IndexError: list index out of range