Add-on registry works & problem!

Hi im installing my add-on directly from windows registry this is the working command in cmd.exe in admin mode:

reg add HKLM\Software\Policies\Mozilla\Firefox\Extensions\Install /v 1 /d
https://addons.mozilla.org/firefox/downloads/file/1212812 /f

So what happens next is weird !!!
My add-on auto install, it Works, so is perfect BUT i get this strange error message !!!

so for every test i was changing the /v 1 to /v 2 etc my real add-on version is 1.9.85
do someone know if that error come because the version doesn’t match ??