# Preview Generator Error **URL:** \ **Category:** ℹ️ Support\ **Tags:** previewgenerator-app\ **Created:** [March 11, 2021, 9:27pm UTC](https://help.nextcloud.com/t/preview-generator-error/110627 "2021-03-11T21:27:44Z")\ **Posts on this page:** 6\ **Page:** 1
**Author:** ![Nobody](https://help.nextcloud.com/letter_avatar/nobody/32/5_5575768a8748004e209b776fc1b2916d.png) [@Nobody](https://help.nextcloud.com/u/Nobody)\ **Post date:** [March 11, 2021, 9:27pm UTC](https://help.nextcloud.com/t/preview-generator-error/110627/1 "2021-03-11T21:27:44Z")
Hi, I want to start a preview:generate-all and I get this error after some minutes: ``` An unhandled exception has been thrown: ValueError: Invalid or uninitialized Zip object in /var/www/nextcloud/lib/private/Archive/ZIP.php:155 Stack trace: #0 /var/www/nextcloud/lib/private/Archive/ZIP.php(155): ZipArchive->getStream() #1 /var/www/nextcloud/lib/private/Preview/Bundled.php(43): OC\Archive\ZIP->extractFile() #2 /var/www/nextcloud/lib/private/Preview/OpenDocument.php(45): OC\Preview\Bundled->extractThumbnail() #3 /var/www/nextcloud/lib/private/Preview/GeneratorHelper.php(63): OC\Preview\OpenDocument->getThumbnail() #4 /var/www/nextcloud/lib/private/Preview/Generator.php(244): OC\Preview\GeneratorHelper->getThumbnail() #5 /var/www/nextcloud/lib/private/Preview/Generator.php(140): OC\Preview\Generator->getMaxPreview() #6 /var/www/nextcloud/lib/private/PreviewManager.php(205): OC\Preview\Generator->generatePreviews() #7 /var/www/nextcloud/apps/previewgenerator/lib/Command/Generate.php(203): OC\PreviewManager->generatePreviews() #8 /var/www/nextcloud/apps/previewgenerator/lib/Command/Generate.php(174): OCA\PreviewGenerator\Command\Generate->parseFile() #9 /var/www/nextcloud/apps/previewgenerator/lib/Command/Generate.php(172): OCA\PreviewGenerator\Command\Generate->parseFolder() #10 /var/www/nextcloud/apps/previewgenerator/lib/Command/Generate.php(172): OCA\PreviewGenerator\Command\Generate->parseFolder() #11 /var/www/nextcloud/apps/previewgenerator/lib/Command/Generate.php(172): OCA\PreviewGenerator\Command\Generate->parseFolder() #12 /var/www/nextcloud/apps/previewgenerator/lib/Command/Generate.php(172): OCA\PreviewGenerator\Command\Generate->parseFolder() #13 /var/www/nextcloud/apps/previewgenerator/lib/Command/Generate.php(155): OCA\PreviewGenerator\Command\Generate->parseFolder() #14 /var/www/nextcloud/apps/previewgenerator/lib/Command/Generate.php(123): OCA\PreviewGenerator\Command\Generate->generateUserPreviews() #15 /var/www/nextcloud/lib/private/User/Manager.php(610): OCA\PreviewGenerator\Command\Generate->OCA\PreviewGenerator\Command\{closure}() #16 /var/www/nextcloud/apps/previewgenerator/lib/Command/Generate.php(124): OC\User\Manager->callForSeenUsers() #17 /var/www/nextcloud/apps/bookmarks/vendor/symfony/console/Command/Command.php(255): OCA\PreviewGenerator\Command\Generate->execute() #18 /var/www/nextcloud/apps/bookmarks/vendor/symfony/console/Application.php(1009): Symfony\Component\Console\Command\Command->run() #19 /var/www/nextcloud/apps/bookmarks/vendor/symfony/console/Application.php(273): Symfony\Component\Console\Application->doRunCommand() #20 /var/www/nextcloud/apps/bookmarks/vendor/symfony/console/Application.php(149): Symfony\Component\Console\Application->doRun() #21 /var/www/nextcloud/lib/private/Console/Application.php(215): Symfony\Component\Console\Application->run() #22 /var/www/nextcloud/console.php(100): OC\Console\Application->run() #23 /var/www/nextcloud/occ(11): require_once('...') ``` Does anyone have an idea what’s wrong? ---
**Author:** ![Sanook](https://help.nextcloud.com/user_avatar/help.nextcloud.com/sanook/32/13847_2.png) [@Sanook](https://help.nextcloud.com/u/Sanook)\ **Post date:** [March 12, 2021, 1:09pm UTC](https://help.nextcloud.com/t/preview-generator-error/110627/2 "2021-03-12T13:09:01Z")
> [@Video file .mp4 preview Is it possible?](https://help.nextcloud.com/t/video-file-mp4-preview-is-it-possible/33498/4): > > Throw an eye on this installation guide: [https://www.allerstorfer.at/nextcloud-install-preview-generator/](https://www.allerstorfer.at/nextcloud-install-preview-generator/) ---
**Author:** ![Nobody](https://help.nextcloud.com/letter_avatar/nobody/32/5_5575768a8748004e209b776fc1b2916d.png) [@Nobody](https://help.nextcloud.com/u/Nobody)\ **Post date:** [March 12, 2021, 1:14pm UTC](https://help.nextcloud.com/t/preview-generator-error/110627/3 "2021-03-12T13:14:25Z")
I saw this and in this way I installed it, but preview generator has some problems with ZIP ---
**Author:** ![cue](https://help.nextcloud.com/letter_avatar/cue/32/5_5575768a8748004e209b776fc1b2916d.png) [@cue](https://help.nextcloud.com/u/cue)\ **Post date:** [September 28, 2021, 8:37am UTC](https://help.nextcloud.com/t/preview-generator-error/110627/4 "2021-09-28T08:37:07Z")
I am having the same problem. ```auto Exception: Invalid or uninitialized Zip object /var/www/html/lib/private/AppFramework/App.php - line 156: OC\AppFramework\Http\Dispatcher->dispatch(OC\Core\Cont ... {}, "getPreviewByFileId") /var/www/html/lib/private/Route/Router.php - line 301: OC\AppFramework\App::main("OC\\Core\\C ... r", "getPreviewByFileId", OC\AppFramew ... {}, { _route: "c ... "}) /var/www/html/lib/base.php - line 1000: OC\Route\Router->match("/core/preview") /var/www/html/index.php - line 36: OC::handleRequest() Caused by ValueError: Invalid or uninitialized Zip object /var/www/html/lib/private/Archive/ZIP.php - line 154: ZipArchive->getStream("Thumbnails/thumbnail.png") /var/www/html/lib/private/Preview/Bundled.php - line 42: OC\Archive\ZIP->extractFile("Thumbnails/thumbnail.png", "/tmp/oc_tmp_muqW3n") /var/www/html/lib/private/Preview/OpenDocument.php - line 44: OC\Preview\Bundled->extractThumbnail(OC\Files\Node\File {}, "Thumbnails/thumbnail.png") ``` ---
**Author:** ![wwe](https://help.nextcloud.com/user_avatar/help.nextcloud.com/wwe/32/72963_2.png) [@wwe](https://help.nextcloud.com/u/wwe)\ **Post date:** [December 13, 2024, 8:48am UTC](https://help.nextcloud.com/t/preview-generator-error/110627/5 "2024-12-13T08:48:18Z")
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**Author:** ![wwe](https://help.nextcloud.com/user_avatar/help.nextcloud.com/wwe/32/72963_2.png) [@wwe](https://help.nextcloud.com/u/wwe)\ **Post date:** [December 13, 2024, 8:48am UTC](https://help.nextcloud.com/t/preview-generator-error/110627/6 "2024-12-13T08:48:19Z")