Running version: 1.4.9.15#dev
Python version: 3.8.5
Operating system: Windows-10-10.0.14393-SP0
Command line: sqlmap.py -r ************ -p ctl00%24ContentPlaceHolder1%24txtPassword --os-pwn
Technique: STACKED
Back-end DBMS: Microsoft SQL Server (fingerprinted)

Traceback (most recent call last):
  File "sqlmap.py", line 215, in main
    start()
  File "lib/core/decorators.py", line 78, in _
    result = f(*args, **kwargs)
  File "lib/controller/controller.py", line 704, in start
    action()
  File "lib/controller/action.py", line 224, in action
    conf.dbmsHandler.osPwn()
  File "plugins/generic/takeover.py", line 273, in osPwn
    self.pwn(goUdf)
  File "lib/takeover/metasploit.py", line 675, in pwn
    debugMsg += "with return code %s" % self._controlMsfCmd(self._msfCliProc, func)
  File "lib/takeover/metasploit.py", line 519, in _controlMsfCmd
    inp += char
TypeError: can only concatenate str (not "bytes") to str