I tried the example show with my mods to suit as shown
C:\legacyLaunch\legacyClient.bat http://192.168.2.200:8088 C Saw_Dust_Collector F
C:\legacyLaunch\LaunchArgsIgnition.txt
Copied the entire contents of the txt file as shown to LaunchArgsIgnition.txt.
I still get the same error.
?????