NameError: name 'Anchor' is not defined

[wwwxjjj]

Traceback (most recent call last):
File "./isign.sh", line 4, in
from isign import isign
File "/Users/Andy/Downloads/isign-develop/isign/isign.py", line 1, in
import archive
File "/Users/Andy/Downloads/isign-develop/isign/archive.py", line 8, in
from bundle import App, Bundle, is_info_plist_native
File "/Users/Andy/Downloads/isign-develop/isign/bundle.py", line 21, in
import signable
File "/Users/Andy/Downloads/isign-develop/isign/signable.py", line 9, in
from codesig import (Codesig,
File "/Users/Andy/Downloads/isign-develop/isign/codesig.py", line 5, in
import macho_cs
File "/Users/Andy/Downloads/isign-develop/isign/macho_cs.py", line 31, in
Anchor("cd_start"),
NameError: name 'Anchor' is not defined

How to solve, thx.