NCP: Cron -> nc-previews -> Could not create folder

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1

Hello,
at some nights, but weirdly not every night, I’m getting the folling error message from a cronjob:

2020-05-23T00:00:02+00:00
2020-05-23T00:00:02+00:00 In Folder.php line 164:
2020-05-23T00:00:02+00:00
2020-05-23T00:00:02+00:00 [OCP\Files\NotPermittedException]
2020-05-23T00:00:02+00:00 Could not create folder
2020-05-23T00:00:02+00:00
2020-05-23T00:00:02+00:00
2020-05-23T00:00:02+00:00 Exception trace:
2020-05-23T00:00:02+00:00 at /var/www/nextcloud/lib/private/Files/Node/Folder.php:164
2020-05-23T00:00:02+00:00 OC\Files\Node\Folder->newFolder() at /var/www/nextcloud/lib/private/Files/AppData/AppData.php:158
2020-05-23T00:00:02+00:00 OC\Files\AppData\AppData->newFolder() at /var/www/nextcloud/lib/private/Preview/Generator.php:433
2020-05-23T00:00:02+00:00 OC\Preview\Generator->getPreviewFolder() at /var/www/nextcloud/lib/private/Preview/Generator.php:119
2020-05-23T00:00:02+00:00 OC\Preview\Generator->getPreview() at /var/www/nextcloud/lib/private/PreviewManager.php:185
2020-05-23T00:00:02+00:00 OC\PreviewManager->getPreview() at /var/www/nextcloud/apps/previewgenerator/lib/Command/PreGenerate.php:205
2020-05-23T00:00:02+00:00 OCA\PreviewGenerator\Command\PreGenerate->processFile() at /var/www/nextcloud/apps/previewgenerator/lib/Command/PreGenerate.php:193
2020-05-23T00:00:02+00:00 OCA\PreviewGenerator\Command\PreGenerate->processRow() at /var/www/nextcloud/apps/previewgenerator/lib/Command/PreGenerate.php:164
2020-05-23T00:00:02+00:00 OCA\PreviewGenerator\Command\PreGenerate->startProcessing() at /var/www/nextcloud/apps/previewgenerator/lib/Command/PreGenerate.php:132
2020-05-23T00:00:02+00:00 OCA\PreviewGenerator\Command\PreGenerate->execute() at /var/www/nextcloud/3rdparty/symfony/console/Command/Command.php:255
2020-05-23T00:00:02+00:00 Symfony\Component\Console\Command\Command->run() at /var/www/nextcloud/3rdparty/symfony/console/Application.php:915
2020-05-23T00:00:02+00:00 Symfony\Component\Console\Application->doRunCommand() at /var/www/nextcloud/3rdparty/symfony/console/Application.php:272
2020-05-23T00:00:02+00:00 Symfony\Component\Console\Application->doRun() at /var/www/nextcloud/3rdparty/symfony/console/Application.php:148
2020-05-23T00:00:02+00:00 Symfony\Component\Console\Application->run() at /var/www/nextcloud/lib/private/Console/Application.php:214
2020-05-23T00:00:02+00:00 OC\Console\Application->run() at /var/www/nextcloud/console.php:99
2020-05-23T00:00:02+00:00 require_once() at /var/www/nextcloud/occ:11
2020-05-23T00:00:02+00:00
2020-05-23T00:00:02+00:00 preview:pre-generate
2020-05-23T00:00:02+00:00

I don’t really understand the issue here. Why is this cron failing sometimes?

2

I have this same issue. For me, I have the error message on 10/19, 10/20, 10/21 and today (10/29) over this 2-wk period. I am running NC 19.0.2.2 on a Raspberry Pi 4 installed and kept to date with NextcloudPi. Another issue is I have preview generation disabled but I guess it still runs every night.

3

Seems like I only get the error message if I store one or more images files to NC the day before.