Error when opening viewer

[deepzillu]

Hello,

I am a beginner at Python coding. When I try to open my file in the viewer I get the following error :

The action “Run Shell Script” encountered an error: “/anaconda3/lib/python3.7/site-packages/vispy/visuals/isocurve.py:22: UserWarning: VisPy is not yet compatible with matplotlib 2.2+ warnings.warn("VisPy is not yet compatible with matplotlib 2.2+") WARNING: Traceback (most recent call last): File "/Users/da/mea-tools/pymea/ui/viewer.py", line 364, in on_visualizationComboBox_currentIndexChanged self.canvas.show_raster() File "/Users/da/mea-tools/pymea/ui/viewer.py", line 47, in show_raster self, self.controller.spike_data) File "/Users/da/mea-tools/pymea/ui/visualizations/raster_vis.py", line 68, in init self.resample() File "/Users/da/mea-tools/pymea/ui/visualizations/raster_vis.py", line 174, in resample self.program['a_position'] = verticies File "/anaconda3/lib/python3.7/site-packages/vispy/gloo/program.py", line 377, in setitem 'not %i.' % (name, numel, data.size)) ValueError: Attribute 'a_position' needs 2 elements, not 0.”

could someone please help me with this? thank you.