protected function checkConfigurationExistence(string $configuration): bool
	{
		$configurations = array_keys($this->config->get('cache.configurations'));

		if(!in_array($configuration, $configurations))
		{
			$message = 'The [ ' . $configuration . ' ] configuration does not exist.';

			if(($suggestion = $this->suggest($configuration, $configurations)) !== null)
			{
				$message .= ' Did you mean [ ' . $suggestion . ' ]?';
			}

			$this->error($message);

			return false;
		}

		return true;
	}