Facebook\WebDriver\Exception\InvalidArgumentException: binary is not a Firefox executable

[smaouad]

Hi,

I'm trying to execute PantherClient with firefox as this
$this->client = static::createPantherClient(['browser' => static::FIREFOX]);
in my .env.test file, I did precise the variables

PANTHER_FIREFOX_BINARY='C:\Program Files\Mozilla Firefox\firefox.exe'
PANTHER_GECKO_DRIVER_BINARY="/usr/local/bin/geckodriver"

But still i got the same error over and over
Facebook\WebDriver\Exception\InvalidArgumentException: binary is not a Firefox executable
Mozilla Firefox 89.0.2
geckodriver 0.29.1

I'm desperate. Any clues please