I have started to get this message "Unable to read configuration, verify that the API key is valid" and it seems to randomly appear when I refresh the page. I am using "TMDB API v3 PHP class" wrapper so the error is actually shown because of these lines of code:

$conf = $this->getConfig();
    if (empty($conf)){echo "Unable to read configuration, verify that the API key is valid";exit;}

The api stats also go down seemingly at the same time I get the error, it just shows "no tables".

What is the issue here? Thanks