public function verifySettings()
    {
        if ($this->targetdir === null) {
            $this->setError("The targetdir attribute is required.");
        }
        if ($this->mapperElement === null) {
            $this->map = new IdentityMapper();
        } else {
            $this->map = $this->mapperElement->getImplementation();
        }
        if ($this->map === null) {
            $this->setError("Could not set <mapper> element.");
        }
    }