My problem with -O Outputfile

[anhmuathu609]

hey bro i run SSH-Brute-Forcer in terminal
root@vultr:~/SSH-Brute-Forcer/src# python3.6 SSHBruteForce.py -I krtest.txt -U kruser.txt -P krpass.txt -t 15 -T 30 -O a.txt
I want to save rerult to file a.txt
my error
[] Simple SSH Brute Forcer
[] Loaded 2493 Targets
[*] Brute Force Starting
Traceback (most recent call last):
File "SSHBruteForce.py", line 282, in
sshBruteForce.startUp()
File "SSHBruteForce.py", line 99, in startUp
self.multipleTargets(options)
File "SSHBruteForce.py", line 144, in multipleTargets
self.showStartInfo()
File "SSHBruteForce.py", line 169, in showStartInfo
Util.appendLineToFile("{} ".format(self.info, self.outputFileName))
TypeError: appendLineToFile() missing 1 required positional argument: 'filename'

can you help me? How to fix error