Exec(): Unable to fork (error message)

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Operating system: Linux 4.19.75-v7
Webserver: Apache/2.4.38 (Raspbian) (apache2handler)
Database: sqlite3 3.27.2
PHP version: 7.3.11-1~deb10u1
Nextcloud version: 17.0.1 - 17.0.1.1

The issue you are facing:
The installation is working fine. However, when I access the Logging page, I see a bunch of error message (example below). It appears the errors are related to the largest image preview being generated. Any suggestion is appreciated.

Is this the first time you’ve seen this error? (Y/N):
No. It is there from the beginning.

Steps to replicate it:

  1. Accessing the Logging page shows the following error messages.

[PHP] Error: exec(): Unable to fork [stat -c %s ‘/var/nextcloud/data/appdata_ocbjjq2yzm6p/preview/3311/4096-2731-max.jpg’] at /var/www/html/nextcloud/lib/private/LargeFileHelper.php#207

[PHP] Error: exec(): Unable to fork [stat -c %s ‘/var/nextcloud/data/appdata_ocbjjq2yzm6p/preview/3310/4096-2731-max.jpg’] at /var/www/html/nextcloud/lib/private/LargeFileHelper.php#207