conversion from musicXML to humdrum issue

[derkveen]

I tried to convert this musicXML to humdrum in the VHV, but not with success. When I split the file from measure 13-24, this second half will do it, but something in the first half seems to prevent it and I can't find what it is.

code is too long to paste here, so I [attached] it.
Z variatio_28_voor_VHV NEW.txt