Well, got the same error...

WORKAROUND [and possible fix - for me it worked]:

- Launch it.
- IGNORE ERROR MESSAGE.
- Right click the top bar of console
- click properties.
- Font
- Change size to 12 [? - for me it worked] [might be smaller for you]
- Click OK.
- Close the error message.
- Launch TacControl.exe again - worked for me.

it only stays open for a few seconds did you had the same problem?
not enough time to change the font size

Braincrush.
For me as long as i don't close / click any button on error message, the console won't close.
Alternative way to launch TacControl:
- click Windows button on screen
- write "cmd" / Alternative: Run program + cmd + enter
- hit Enter
- Right click the top bar of console
- click properties.
- Font
- Change size to 12 [? - for me it worked] [might be smaller for you]
- Click OK.
- Copy and paste location
"_DRIVE_PATCH TO STEAM_\Steam\Arma 3\!Workshop\@TacControl\TacControl.exe"

Need to remember " at start add \TacControl.exe and close with "

[for me is "H:\Symlink\Steam\Arma 3\!Workshop\@TacControl\TacControl.exe" since I moved Arma onto SSD, while keeping mods on HDD]
I will post another workaround in a moment [if possible with .bat file]

Alternative:

- Make a new text file inside @TacControl.
- Open it.
- Paste:

@echo
pause
prompt "Do it now"
TacControl.exe

- Save as
File name: Start.bat
Save as type: All Files (*.*)

- Save

- Now you can change the size in properties:
- 8x12 - is working.
- Ok.
- Click any button to launch Taccontrol :P

Note: I am not aware of any command to change to font size via command.

thanks worked for me

The code that did this is here by the way: https://github.com/WolfCorps/TacControl/blob/master/src/DesktopClient/App.xaml.cs#L31-L57