Bug: Keysight N5249A PNA-X network analyzer trace error

Regardless of which qcodes release(tried with 4 different qcodes version) I use whenever I want to have trace data of network analyzer, N5249A, I get could not convert string to float: 'S21' error. My code is simple. I first set the required parameter for the network analyzer and then try to get trace data: data=qc.Measure(vna.trace).run(name='test')

my code is:

vna.sweep_mode('CONT')
vna.start(150.1e6)
vna.stop(350.1e6)
vna.power(-23)
vna.points(1601)# 1601
vna.if_bandwidth(1000)
vna.trace("S21")
data=qc.Measure(vna.trace).run(name='test') 

and it returns this error:

ValueError                                Traceback (most recent call last)
<ipython-input-8-48831a7c8d52> in <module>
----> 1 data=qc.Measure(vna.trace).run(name='test')
      2 
      3 # plot
      4 #plot = MatPlot(data.vna_magnitude, data.vna_phase)
      5 #plot.save()

~\anaconda3\envs\qcodes10\lib\site-packages\qcodes\measure.py in run(self, use_threads, quiet, station, **kwargs)
     83 
     84         # run the measurement as if it were a Loop
---> 85         self._dummyLoop.run(use_threads=use_threads,
     86                             station=station, quiet=True)
     87 

~\anaconda3\envs\qcodes10\lib\site-packages\qcodes\loops.py in run(self, use_threads, quiet, station, progress_interval, set_active, *args, **kwargs)
    745             if not quiet:
    746                 print(datetime.now().strftime('Started at %Y-%m-%d %H:%M:%S'))
--> 747             self._run_wrapper()
    748             ds = self.data_set
    749         finally:

~\anaconda3\envs\qcodes10\lib\site-packages\qcodes\loops.py in _run_wrapper(self, *args, **kwargs)
    794     def _run_wrapper(self, *args, **kwargs):
    795         try:
--> 796             self._run_loop(*args, **kwargs)
    797         finally:
    798             if hasattr(self, 'data_set'):

~\anaconda3\envs\qcodes10\lib\site-packages\qcodes\loops.py in _run_loop(self, first_delay, action_indices, loop_indices, current_values, **ignore_kwargs)
    882                     # log.debug('Going through callables at this sweep step.'
    883                     #           ' Calling {}'.format(f))
--> 884                     f(first_delay=delay,
    885                       loop_indices=new_indices,
    886                       current_values=new_values)

~\anaconda3\envs\qcodes10\lib\site-packages\qcodes\actions.py in __call__(self, loop_indices, **ignore_kwargs)
    165                 out_dict[param_id] = param_out
    166 
--> 167         self.store(loop_indices, out_dict)
    168 
    169 

~\anaconda3\envs\qcodes10\lib\site-packages\qcodes\data\data_set.py in store(self, loop_indices, ids_values)
    404          """
    405         for array_id, value in ids_values.items():
--> 406             self.arrays[array_id][loop_indices] = value
    407         self.last_store = time.time()
    408         if (self.write_period is not None and

~\anaconda3\envs\qcodes10\lib\site-packages\qcodes\data\data_array.py in __setitem__(self, loop_indices, value)
    339         self._update_modified_range(min_li, max_li)
    340 
--> 341         self.ndarray.__setitem__(loop_indices, value)
    342 
    343     def __getitem__(self, loop_indices):

ValueError: could not convert string to float: 'S21'

Reproduce the failure with the provided N5249A setup and measurement snippet, then trace the value through qcodes/measure.py and qcodes/data/data_array.py as shown in the traceback. Done means the S21 trace measurement stores numeric trace data without the string-conversion error.