DC demo can not work properly

Dear contributers:

I encountered a problem when I was familiar with the DC module, I note there is a demo from the doc web; it works well when I down download it and just run.

When I simplely change the “data_type” in the dome form “volt” to " apparent_resistivity" there is a mistake jumped out when I simulation,it said " Receiver geometric factor has not been set, please execute survey.set_geometric_factor()".

when I change the “data_type” to other parameters, other errors will occur.
I’m not sure if I’m the only one with this problem or it is a small bug in the code.

the code file is enclosed.

thanks for your reply !

plot_fwd_2_dcr2d.ipynb (39.9 KB)