Error when trying to access plugin settings page

[alexlushsevernunival]

Getting the following error when trying to access the plugin settings page:

Fatal error: Uncaught Error: Call to undefined function shell_exec() in /home/storage/974/4224974/user/htdocs/plugins/tag_recognition/api_classes/Imagga.php:10 Stack trace: #0 /home/storage/974/4224974/user/htdocs/plugins/tag_recognition/admin.php(41): Imagga->getInfo() #1 /home/storage/974/4224974/user/htdocs/admin/plugin.php(53): include_once('/home/storage/9...') #2 /home/storage/974/4224974/user/htdocs/admin.php(406): include('/home/storage/9...') #3 {main} thrown in /home/storage/974/4224974/user/htdocs/plugins/tag_recognition/api_classes/Imagga.php on line 10

Any ideas?

Plugin version 15b
Piwigo version 15.5.0
PHP version 8.3

Thanks in advance.

Alex.