Unsupported file extension 'oubleday portrait,jpg'. (#0)

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Trace:

#0 /var/www/pft_dev/app/helpers/Image.php(36): Nette\Utils\Image->save('/var/www/pft_de...', 95)
#1 [internal function]: app\helpers\Image::thumbnail('/var/www/pft_de...', 210, 210)
#2 /var/www/pft_dev/vendor/piko/framework/src/Component.php(79): call_user_func_array('app\\helpers\\Ima...', Array)
#3 /var/www/pft_dev/app/modules/site/views/gallery/view.phtml(41): piko\Component->__call('thumbnail', Array)
#4 /var/www/pft_dev/vendor/piko/framework/src/View.php(358): require('/var/www/pft_de...')
#5 /var/www/pft_dev/vendor/piko/framework/src/Controller.php(89): piko\View->render('/var/www/pft_de...', Array)
#6 /var/www/pft_dev/app/modules/site/controllers/GalleryController.php(82): piko\Controller->render('view', Array)
#7 /var/www/pft_dev/vendor/piko/framework/src/Controller.php(71): app\modules\site\controllers\GalleryController->viewAction()
#8 /var/www/pft_dev/vendor/piko/framework/src/Module.php(114): piko\Controller->runAction('view')
#9 /var/www/pft_dev/vendor/piko/framework/src/Application.php(199): piko\Module->run('gallery', 'View')
#10 /var/www/pft_dev/vendor/piko/framework/src/Application.php(159): piko\Application->dispatch('site/gallery/vi...')
#11 /var/www/pft_dev/public/index.php(29): piko\Application->run()
#12 {main}