sqlmap version: 1.1.11.25#dev
Python version: 2.7.10
Operating system: posix
Command line: sqlmap.py -r api-payment-post.pen --dbms=mysql --answers=custom=Y,follow=N,extending=Y,union=Y,vulnerable=Y,proceed=C,JSON=Y -v 1 --user-agent=Mozilla/4.0 --flush-session --fresh-queries --eval=import subprocess;PHPSESSID=subprocess.check_output('./cookie-retrieval.sh', shell=True) --threads=5
Technique: None
Back-end DBMS: MySQL (identified)

Traceback (most recent call last):
  File "sqlmap.py", line 156, in main
    start()
  File "lib/controller/controller.py", line 547, in start
    injection = checkSqlInjection(place, parameter, value)
  File "lib/controller/checks.py", line 474, in checkSqlInjection
    Request.queryPage(genCmpPayload(), place, raise404=False)
  File "lib/request/connect.py", line 1136, in queryPage
    if re.search(regex, (cookie or "")):
  File "System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/re.py", line 146, in search
    return _compile(pattern, flags).search(string)
  File "System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/re.py", line 251, in _compile
    raise error, v # invalid expression
error: unbalanced parenthesis