$this->webDriver->wait(5, 100)->until(WebDriverExpectedCondition::elementToBeClickable(WebDriverBy::cssSelector('#' . $modalId . ' #btnAgreeModalOk')));

Unhandled exception

public function mWaitForAjax($timeout = 5)
{
    $this->webMobileDriver->wait($timeout)->until(function () {
        $condition = 'return ($.active == 0);';
        return $this->webMobileDriver->executeScript($condition);
    });
}