output/cnn folder got no files output

[NickShanyt]

Hi,
I tested one of the "data/input/experiment" protein input，but the "output/cnn" got no files, and there were some errors or warnings :
"/content/Ca-Backbone-Prediction/postprocessing/build_backbone_trace.py:420: RuntimeWarning: invalid value encountered in arccos
angle = np.arccos(cosine_angle)"
"warning: duplicate atom serial number found: 1"

when I use the "pulchra" to process the .pdb file, the result is not what it should be.

I am wondering if you could tell me what's wrong with it, thanks.