RuntimeException thrown

D:\Inetpub\vhosts\miscellaneousphotographs.com\httpdocs\wp-content\plugins\nextgen-gallery/templates\D:\Inetpub\vhosts\miscellaneousphotographs.com\httpdocs\wp-content\plugins\nextgen-gallery\templates\Thumbnails\default-view.php.php is not a valid MVC template