WPTAgent not getting initiated

I was using private instance and recently started migration to wptagent. Hosted in server perfectly with location configured as expected.

Installed all the requirements in WPT client as mentioned in ‘https://github.com/WPO-Foundation/wptagent/blob/master/docs/install.md

Using batch file to start WPTAgent but getting error, details below . Please help.

Batch File content:
cd C:\wpt_agent_sep2018\wptagent
call npm i -g lighthouse
FOR /L %%x IN (1, 1, 24) DO (
python.exe C:\wpt_agent_sep2018\wptagent\wptagent.py -vvvv --server “http://<>:8081/work/” --location PT_Team_WPTDriver
)

Error Details :
Traceback (most recent call last):
File “C:\wpt_agent_sep2018\wptagent\wptagent.py”, line 705, in
main()
File “C:\wpt_agent_sep2018\wptagent\wptagent.py”, line 692, in main
browsers = find_browsers()
File “C:\wpt_agent_sep2018\wptagent\wptagent.py”, line 465, in find_browsers
build = get_windows_build()
File “C:\wpt_agent_sep2018\wptagent\wptagent.py”, line 395, in get_windows_build
return int(output.strip().split(’ ')[-1])
ValueError: invalid literal for int() with base 10: ‘’