Analog Discovery 2 run failed with WaveForm V3.20.1

I use WaveForm v3.19.5_64bit without problems.

I have a problem with Analog Discovery 2, running the example AnalogImpedance_Analyzer.py, the following problem is reported.



python -u "e:\workspace_DG\CellUpLink\AnalogImpedance_Analyzer.py"
DWF Version: b'3.20.1'
Opening first device
Reference: 1000.0 Ohm  Frequency: 100.0 Hz ... 1000.0 kHz for nanofarad capacitors
Step: 0 100.0Hz
Step: 1 106.33265716371616Hz
Step: 2 113.06633979496387Hz
Step: 3 120.22644346174131Hz
Step: 4 127.83997194630231Hz
Step: 5 135.93563908785254Hz
Step: 6 144.5439770745928Hz
Step: 7 153.6974515935271Hz
Step: 8 163.43058427231378Hz
Step: 9 173.78008287493762Hz
Step: 10 184.78497974222907Hz
Step: 11 196.4867789993468Hz
Step: 12 208.92961308540387Hz
Step: 13 222.16040919558117Hz
Step: 14 236.22906626344627Hz
Step: 15 251.18864315095794Hz
Step: 16 267.09555875589854Hz
Step: 17 284.0098047914214Hz
Step: 18 301.99517204020157Hz
Step: 19 321.1194909364824Hz
Step: 20 341.4548873833601Hz
Step: 21 363.0780547701014Hz
Step: 22 386.0705432153815Hz
Step: 23 410.5190671273079Hz
Step: 24 436.5158322401661Hz
Step: 25 464.15888336127773Hz
Step: 26 493.5524741394807Hz
Step: 27 524.8074602497722Hz
Step: 28 558.0417174769964Hz
Step: 29 593.3805862753281Hz
Step: 30 630.957344480193Hz
Step: 31 670.9137099554112Hz
Step: 32 713.4003750712565Hz
Step: 33 758.5775750291837Hz
Step: 34 806.6156921766136Hz
Step: 35 857.6958985908947Hz
Step: 36 912.0108393559096Hz
Step: 37 969.7653591082495Hz
Step: 38 1031.1772745930562Hz
Step: 39 1096.4781961431852Hz
Step: 40 1165.9144011798312Hz
Step: 41 1239.747763028944Hz
Step: 42 1318.2567385564075Hz
Step: 43 1401.7374183467693Hz
Step: 44 1490.504643386196Hz
Step: 45 1584.893192461114Hz
Step: 46 1685.259044750751Hz
Step: 47 1791.980722375334Hz
Step: 48 1905.4607179632483Hz
Step: 49 2026.1270126211432Hz
Step: 50 2154.434690031882Hz
Step: 51 2290.8676527677744Hz
Step: 52 2435.940447292027Hz
Step: 53 2590.2002045313225Hz
Step: 54 2754.228703338166Hz
Step: 55 2928.6445646252373Hz
Step: 56 3114.1055844467583Hz
Step: 57 3311.311214825911Hz
Step: 58 3521.0052016845207Hz
Step: 59 3743.9783898238106Hz
Step: 60 3981.0717055349733Hz
Step: 61 4233.179328088211Hz
Step: 62 4501.252062061337Hz
Step: 63 4786.30092322638Hz
Step: 64 5089.400951518093Hz
Step: 65 5411.6952654646375Hz
Step: 66 5754.399373371567Hz
Step: 67 6118.805757518219Hz
Step: 68 6506.288748655574Hz
Step: 69 6918.309709189362Hz
Step: 70 7356.422544596414Hz
Step: 71 7822.279563860029Hz
Step: 72 8317.63771102671Hz
Step: 73 8844.365191386Hz
Step: 74 9404.448517263523Hz
Step: 75 10000.0Hz
Step: 76 10633.265716371616Hz
Step: 77 11306.633979496386Hz
Step: 78 12022.644346174131Hz
Step: 79 12783.99719463023Hz
Step: 80 13593.563908785254Hz
Step: 81 14454.397707459279Hz
Step: 82 15369.74515935271Hz
Step: 83 16343.058427231375Hz
Step: 84 17378.00828749376Hz
Step: 85 18478.497974222908Hz
Step: 86 19648.67789993468Hz
Step: 87 20892.961308540387Hz
Step: 88 22216.040919558116Hz
Step: 89 23622.90662634463Hz
Step: 90 25118.864315095794Hz
Step: 91 26709.555875589853Hz
Step: 92 28400.980479142137Hz
Step: 93 30199.51720402016Hz
Step: 94 32111.949093648236Hz
Step: 95 34145.488738336004Hz
Step: 96 36307.80547701014Hz
Step: 97 38607.05432153811Hz
Step: 98 41051.906712730786Hz
Step: 99 43651.58322401661Hz
Step: 100 46415.88833612778Hz
Step: 101 49355.24741394806Hz
Step: 102 52480.746024977285Hz
Step: 103 55804.171747699635Hz
Step: 104 59338.05862753281Hz
Step: 105 63095.734448019306Hz
Step: 106 67091.37099554112Hz
Step: 107 71340.03750712564Hz
Step: 108 75857.75750291836Hz
Step: 109 80661.56921766135Hz
Step: 110 85769.58985908938Hz
Step: 111 91201.08393559097Hz
Step: 112 96976.53591082495Hz
Step: 113 103117.72745930549Hz
Step: 114 109647.8196143185Hz
Step: 115 116591.44011798322Hz
Step: 116 123974.77630289442Hz
Step: 117 131825.67385564072Hz
Step: 118 140173.74183467694Hz
Step: 119 149050.4643386196Hz
Step: 120 158489.31924611144Hz
Step: 121 168525.9044750751Hz
Step: 122 179198.0722375334Hz
Step: 123 190546.07179632463Hz
Step: 124 202612.70126211434Hz
Step: 125 215443.46900318845Hz
Step: 126 229086.76527677724Hz
Step: 127 243594.0447292027Hz
Step: 128 259020.02045313254Hz
Step: 129 275422.8703338166Hz
Step: 130 292864.4564625237Hz
Step: 131 311410.5584446759Hz
Step: 132 331131.1214825911Hz
Step: 133 352100.5201684521Hz
Step: 134 374397.83898238104Hz
Step: 135 398107.17055349733Hz
Step: 136 423317.9328088207Hz
Step: 137 450125.20620613365Hz
Step: 138 478630.09232263855Hz
Step: 139 508940.0951518088Hz
Step: 140 541169.5265464637Hz
Step: 141 575439.9373371566Hz
Step: 142 611880.5757518219Hz
Step: 143 650628.8748655573Hz
Step: 144 691830.9709189363Hz
Step: 145 735642.2544596414Hz
Step: 146 782227.956386003Hz
Step: 147 831763.7711026708Hz
Step: 148 884436.5191385999Hz
Step: 149 940444.8517263514Hz
Step: 150 1000000.0Hz
Exception in Tkinter callback
Traceback (most recent call last):
  File "C:\Python\lib\tkinter\__init__.py", line 1921, in __call__
    return self.func(*args)
  File "C:\Python\lib\tkinter\__init__.py", line 839, in callit
    func(*args)
  File "C:\Python\lib\site-packages\matplotlib\backends\_backend_tk.py", line 271, in idle_draw
    self.draw()
  File "C:\Python\lib\site-packages\matplotlib\backends\backend_tkagg.py", line 10, in draw
    super().draw()
  File "C:\Python\lib\site-packages\matplotlib\backends\backend_agg.py", line 400, in draw
    self.figure.draw(self.renderer)
  File "C:\Python\lib\site-packages\matplotlib\artist.py", line 95, in draw_wrapper
    result = draw(artist, renderer, *args, **kwargs)
  File "C:\Python\lib\site-packages\matplotlib\artist.py", line 72, in draw_wrapper
    return draw(artist, renderer)
  File "C:\Python\lib\site-packages\matplotlib\figure.py", line 3140, in draw
    mimage._draw_list_compositing_images(
  File "C:\Python\lib\site-packages\matplotlib\image.py", line 131, in _draw_list_compositing_images
    a.draw(renderer)
  File "C:\Python\lib\site-packages\matplotlib\artist.py", line 72, in draw_wrapper
    return draw(artist, renderer)
  File "C:\Python\lib\site-packages\matplotlib\axes\_base.py", line 3064, in draw
    mimage._draw_list_compositing_images(
  File "C:\Python\lib\site-packages\matplotlib\image.py", line 131, in _draw_list_compositing_images
    a.draw(renderer)
  File "C:\Python\lib\site-packages\matplotlib\artist.py", line 72, in draw_wrapper
    return draw(artist, renderer)
  File "C:\Python\lib\site-packages\matplotlib\axis.py", line 1376, in draw
    ticks_to_draw = self._update_ticks()
  File "C:\Python\lib\site-packages\matplotlib\axis.py", line 1262, in _update_ticks
    major_locs = self.get_majorticklocs()
  File "C:\Python\lib\site-packages\matplotlib\axis.py", line 1484, in get_majorticklocs
    return self.major.locator()
  File "C:\Python\lib\site-packages\matplotlib\ticker.py", line 2341, in __call__
    return self.tick_values(vmin, vmax)
  File "C:\Python\lib\site-packages\matplotlib\ticker.py", line 2358, in tick_values
    raise ValueError(
ValueError: Data has no positive values, and therefore can not be log-scaled.
Exception in Tkinter callback
Traceback (most recent call last):
  File "C:\Python\lib\tkinter\__init__.py", line 1921, in __call__
    return self.func(*args)
  File "C:\Python\lib\tkinter\__init__.py", line 839, in callit
    func(*args)
  File "C:\Python\lib\site-packages\matplotlib\backends\_backend_tk.py", line 271, in idle_draw
    self.draw()
  File "C:\Python\lib\site-packages\matplotlib\backends\backend_tkagg.py", line 10, in draw
    super().draw()
  File "C:\Python\lib\site-packages\matplotlib\backends\backend_agg.py", line 400, in draw
    self.figure.draw(self.renderer)
  File "C:\Python\lib\site-packages\matplotlib\artist.py", line 95, in draw_wrapper
    result = draw(artist, renderer, *args, **kwargs)
  File "C:\Python\lib\site-packages\matplotlib\artist.py", line 72, in draw_wrapper
    return draw(artist, renderer)
  File "C:\Python\lib\site-packages\matplotlib\figure.py", line 3140, in draw
    mimage._draw_list_compositing_images(
  File "C:\Python\lib\site-packages\matplotlib\image.py", line 131, in _draw_list_compositing_images
    a.draw(renderer)
  File "C:\Python\lib\site-packages\matplotlib\artist.py", line 72, in draw_wrapper
    return draw(artist, renderer)
  File "C:\Python\lib\site-packages\matplotlib\axes\_base.py", line 3064, in draw
    mimage._draw_list_compositing_images(
  File "C:\Python\lib\site-packages\matplotlib\image.py", line 131, in _draw_list_compositing_images
    a.draw(renderer)
  File "C:\Python\lib\site-packages\matplotlib\artist.py", line 72, in draw_wrapper
    return draw(artist, renderer)
  File "C:\Python\lib\site-packages\matplotlib\axis.py", line 1376, in draw
    ticks_to_draw = self._update_ticks()
  File "C:\Python\lib\site-packages\matplotlib\axis.py", line 1262, in _update_ticks
    major_locs = self.get_majorticklocs()
  File "C:\Python\lib\site-packages\matplotlib\axis.py", line 1484, in get_majorticklocs
    return self.major.locator()
  File "C:\Python\lib\site-packages\matplotlib\ticker.py", line 2341, in __call__
    return self.tick_values(vmin, vmax)
  File "C:\Python\lib\site-packages\matplotlib\ticker.py", line 2358, in tick_values
    raise ValueError(
ValueError: Data has no positive values, and therefore can not be log-scaled.