From the screenshot, you’re not specifying the name of the blendshape node in the script.
If you replace your line 14 as shown in below (by adding the blendshape node), I think it should work?
bsNode = 'Mesh_007FBXASC046001_ncl1_2' # the name is from your screenshot
mc.setKeyframe(bsNode + '.' + facsNames[i], v=weightMat[fr][i], t=fr)