Sort error: preg_match()

Warning: preg_match() expects parameter 2 to be string, object given в Drupal\Core\File\FileSystem->uriScheme() (line 286 from domain.com/core/lib/Drupal/Core/File/FileSystem.php) #0 domain.com/core/includes/bootstrap.inc(584): _drupal_error_handler_real(2, 'preg_match() ex...', '/var/www/agulik...', 286, Array) #1 [internal function]: _drupal_error_handler(2, 'preg_match() ex...', '/var/www/agulik...', 286, Array) #2 domain.com/core/lib/Drupal/Core/File/FileSystem.php(286): preg_match('/^([\\w\\-]+):\\/\\...', Object(Drupal\Core\Field\FieldItemList), NULL) #3 domain.com/core/includes/file.inc(87): Drupal\Core\File\FileSystem->uriScheme(Object(Drupal\Core\Field\FieldItemList)) #4 domain.com/modules/media_watermark/src/Form/BatchWatermarkForm.php(251): file_uri_scheme(Object(Drupal\Core\Field\FieldItemList)) #5 domain.com/modules/media_watermark/src/Form/BatchWatermarkForm.php(125): Drupal\media_watermark\Form\BatchWatermarkForm->getImageFiles() #6 [internal function]: Drupal\media_watermark\Form\BatchWatermarkForm->buildForm(Array, Object(Drupal\Core\Form\FormState)) #7 domain.com/core/lib/Drupal/Core/Form/FormBuilder.php(518): call_user_func_array(Array, Array) #8 domain.com/core/lib/Drupal/Core/Form/FormBuilder.php(275): Drupal\Core\Form\FormBuilder->retrieveForm('media_watermark...', Object(Drupal\Core\Form\FormState)) #9 domain.com/core/lib/Drupal/Core/Controller/FormController.php(93): Drupal\Core\Form\FormBuilder->buildForm('media_watermark...', Object(Drupal\Core\Form\FormState)) #10 [internal function]: Drupal\Core\Controller\FormController->getContentResult(Object(Symfony\Component\HttpFoundation\Request), Object(Drupal\Core\Routing\RouteMatch)) #11 domain.com/core/lib/Drupal/Core/EventSubscriber/EarlyRenderingControllerWrapperSubscriber.php(123): call_user_func_array(Array, Array) #12 domain.com/core/lib/Drupal/Core/Render/Renderer.php(582): Drupal\Core\EventSubscriber\EarlyRenderingControllerWrapperSubscriber->Drupal\Core\EventSubscriber\{closure}() #13 domain.com/core/lib/Drupal/Core/EventSubscriber/EarlyRenderingControllerWrapperSubscriber.php(124): Drupal\Core\Render\Renderer->executeInRenderContext(Object(Drupal\Core\Render\RenderContext), Object(Closure)) #14 domain.com/core/lib/Drupal/Core/EventSubscriber/EarlyRenderingControllerWrapperSubscriber.php(97): Drupal\Core\EventSubscriber\EarlyRenderingControllerWrapperSubscriber->wrapControllerExecutionInRenderContext(Array, Array) #15 domain.com/vendor/symfony/http-kernel/HttpKernel.php(151): Drupal\Core\EventSubscriber\EarlyRenderingControllerWrapperSubscriber->Drupal\Core\EventSubscriber\{closure}() #16 domain.com/vendor/symfony/http-kernel/HttpKernel.php(68): Symfony\Component\HttpKernel\HttpKernel->handleRaw(Object(Symfony\Component\HttpFoundation\Request), 1) #17 domain.com/core/lib/Drupal/Core/StackMiddleware/Session.php(57): Symfony\Component\HttpKernel\HttpKernel->handle(Object(Symfony\Component\HttpFoundation\Request), 1, true) #18 domain.com/core/lib/Drupal/Core/StackMiddleware/KernelPreHandle.php(47): Drupal\Core\StackMiddleware\Session->handle(Object(Symfony\Component\HttpFoundation\Request), 1, true) #19 domain.com/core/modules/page_cache/src/StackMiddleware/PageCache.php(99): Drupal\Core\StackMiddleware\KernelPreHandle->handle(Object(Symfony\Component\HttpFoundation\Request), 1, true) #20 domain.com/core/modules/page_cache/src/StackMiddleware/PageCache.php(78): Drupal\page_cache\StackMiddleware\PageCache->pass(Object(Symfony\Component\HttpFoundation\Request), 1, true) #21 domain.com/core/lib/Drupal/Core/StackMiddleware/ReverseProxyMiddleware.php(47): Drupal\page_cache\StackMiddleware\PageCache->handle(Object(Symfony\Component\HttpFoundation\Request), 1, true) #22 domain.com/core/lib/Drupal/Core/StackMiddleware/NegotiationMiddleware.php(52): Drupal\Core\StackMiddleware\ReverseProxyMiddleware->handle(Object(Symfony\Component\HttpFoundation\Request), 1, true) #23 domain.com/vendor/stack/builder/src/Stack/StackedHttpKernel.php(23): Drupal\Core\StackMiddleware\NegotiationMiddleware->handle(Object(Symfony\Component\HttpFoundation\Request), 1, true) #24 domain.com/core/lib/Drupal/Core/DrupalKernel.php(665): Stack\StackedHttpKernel->handle(Object(Symfony\Component\HttpFoundation\Request), 1, true) #25 domain.com/index.php(19): Drupal\Core\DrupalKernel->handle(Object(Symfony\Component\HttpFoundation\Request)) #26 {main}.