Bug

[TheyCallMeSticky]

private function getFirstErrorString($error){

    if (!is_string($error)) {
        return $this->getFirstErrorString(array_values($error)[0]);
    }
    return $error;
}

on this code i have an error. "if (!is_string($error)) {" but $error is not a string or an array. this return me a 500.

i can suggest :

private function getFirstErrorString($error){

    if (is_array($error)) {
        return $this->getFirstErrorString(array_values($error)[0]);
    }
    return $error;
}

the final error i get is : "We can't serve the download. Check why in the params. ()". i still don't know why