BetterReflection\SourceLocator\Exception\InvalidDirectory::fromNonDirectory PHP Method

    public static function fromNonDirectory($nonDirectory)
    {
        if (!file_exists($nonDirectory)) {
            return new self(sprintf('"%s" does not exists', $nonDirectory));
        }
        return new self(sprintf('"%s" must be a directory, not a file', $nonDirectory));
    }

 /**
  * @param string[] $directories directories to scan
  *
  * @throws InvalidDirectory
  * @throws InvalidFileInfo
  */
 public function __construct(array $directories)
 {
     $this->aggregateSourceLocator = new AggregateSourceLocator(array_values(array_map(function ($directory) {
         if (!is_string($directory)) {
             throw InvalidDirectory::fromNonStringValue($directory);
         }
         if (!is_dir($directory)) {
             throw InvalidDirectory::fromNonDirectory($directory);
         }
         return new FileIteratorSourceLocator(new RecursiveIteratorIterator(new RecursiveDirectoryIterator($directory, RecursiveDirectoryIterator::SKIP_DOTS)));
     }, $directories)));
 }