This is verbose logs I've got:
main debug: VoutDisplayEvent 'mouse button' 0 t=8
main debug: VoutDisplayEvent 'mouse button' 0 t=9
main debug: auto hiding mouse cursor
qt debug: activating or triggering extension 'VLsub 0.11.1'
lua debug: Reactivating extension VLsub 0.11.1
lua debug: [VLsub] Welcome
lua debug: [VLSub] Working directory: C:\Users\Dell\AppData\Roaming\vlc\lua\extensions\userdata\vlsub
lua debug: [VLSub] Loading config file: C:\Users\Dell\AppData\Roaming\vlc\lua\extensions\userdata\vlsub\vlsub_conf.xml
lua debug: [VLSub] Video URI: http://192.168.0.18:64443/
lua warning: Error while running script C:\Program Files\VideoLAN\VLC\lua\extensions\VLSub.luac, function activate(): ...ackage/win32/../../../share/lua/extensions/VLSub.lua bad argument #1 to 'gsub' (string expected, got nil)
lua error: Could not activate extension!
lua debug: Deactivating 'VLsub 0.11.1'
main debug: auto hiding mouse cursor
main debug: auto hiding mouse cursor
main debug: auto hiding mouse cursor