Tutorial_Evoked_Responses_In_The_Visual_Cortex is incorrect

Reported on Google group by Toygun Başaklar:

Hi everyone,

So I'm new to TVB and dealing with the evoked responses in the visual cortex. So I found this tutorial (https://github.com/the-virtual-brain/tvb-documentation/blob/master/tutorials/Tutorial_Evoked_Responses_In_The_Visual_Cortex.ipynb) and tried to observe the outcome of this. I tried it in both scripting interface and the web based GUI. I did what exactly the tutorial says but after this line,

rec = (monitors.TemporalAverage(period=1e3 / 2048.), monitors.EEG(projection_matrix_data = pr, period=1e3/2048.))

I get this error:

Traceback (most recent call last):
  File "<pyshell#8>", line 1, in <module>
    rec = (monitors.TemporalAverage(period=1e3 / 2048.), monitors.EEG(projection_matrix_data = pr, period=1e3/2048.))
NameError: name 'pr' is not defined

But "pr" is defined in the above code like this

root_path = os.path.dirname(simulator.__file__)
proj_mat_path = os.path.join(root_path,'files', "connectivity","o52r00_irp2008", "projection_eeg_1020_62.mat")
matlab_data = io.matlab.loadmat(proj_mat_path)
eeg_projection = matlab_data["ProjectionMatrix"]
    
pr = projections.ProjectionRegionEEG()
pr.projection_data = eeg_projection

I can't solve the problem. Can you help me ?

Also when I tried to apply this tutorial on web based GUI, It also gives me an error like this:

'Discrete equation' has no attribute '_pattern'

And I read all the manuals for the web based GUI, I believe I did not do nothing wrong. Although when I select the "Spatiotemporal stimulus" as "None", It gives me default EEG signals.

Thanks in advance