sqlmap version: 1.2.2.9#dev
Python version: 2.7.14
Operating system: Windows-10-10.0.16299
Command line: sqlmap.py -r C:\Users\***\Desktop\xx --level 4 --dbs --password --tamper=apostrophemask,apostrophenullencode,appendnullbyte,base64encode,between,bluecoat,chardoubleencode,charencode,charunicodeencode,concat2concatws,equaltolike,greatest,halfversionedmorekeywords,ifnull2ifisnull,modsecurityversioned,modsecurityzeroversioned,multiplespaces,nonrecursivereplacement,percentage,randomcase,randomcomments,securesphere,space2comment,space2dash,space2hash,space2morehash,space2mssqlblank,space2mssqlhash,space2mysqlblank,space2mysqldash,space2plus,space2randomblank,sp_password,unionalltounion,unmagicquotes,versionedkeywords,versionedmorekeywords
Technique: None
Back-end DBMS: None

Traceback (most recent call last):
  File "sqlmap.py", line 141, in main
    init()
  File "lib/core/option.py", line 2636, in init
    _setTamperingFunctions()
  File "lib/core/option.py", line 965, in _setTamperingFunctions
    function()
  File "tamper/appendnullbyte.py", line 15, in dependencies
    singleTimeWarnMessage("tamper script '%s' is only meant to be run against %s" % (os.path.basename(__file__).split(".")[0], DBMS.ACCESS))
NameError: global name 'os' is not defined