Mac OSX run a2sv.py ERROR:OSError: [Errno 2] No such file or directory

[ghost]

Traceback (most recent call last):
  File "a2sv.py", line 421, in <module>
    runScan(checkVun)
  File "a2sv.py", line 131, in runScan
    result = subprocess.Popen(['timeout','4','openssl','s_client','-connect',targetIP+":"+str(port)], stderr=subprocess.STDOUT, stdout=subprocess.PIPE).communicate()[0]
  File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/subprocess.py", line 710, in __init__
    errread, errwrite)
  File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/subprocess.py", line 1335, in _execute_child
    raise child_exception
OSError: [Errno 2] No such file or directory