Cascade Convert Problem

My Cascade file works fine in Opencv , so i think xml file is ok,but when I Convert it for openmv, error happens.

$python2.7 cascade_convert.py -i cascade15.xml
Parsing new XML format…
size:40x40
stages:8
features:22
rectangles:0

$ python2.7 cascade_convert.py cascade15.xml
Converting new XML format…
Traceback (most recent call last):
File “cascade_convert.py”, line 422, in
main()
File “cascade_convert.py”, line 419, in main
cascade_binary_universal(args.file, args.stages, args.name)
File “cascade_convert.py”, line 101, in cascade_binary_universal
cascade_binary(path, n_stages, name)
File “cascade_convert.py”, line 170, in cascade_binary
fout.write(struct.pack(‘h’, int(float(t.childNodes[0].nodeValue.split()[3])*4096))) #int16_t
struct.error: short format requires SHRT_MIN <= number <= SHRT_MAX

Hi, is this an LBP or HoG cascade ? We only support the Haar cascade.