I can't see the WP Cerber dashboard

Hi all,
After to install WP Cerber plugin, the Dashboard tab isn’t work fine.
By email, I’ve recived this message:

WordPress versión 6.7.2

Tema activo: Astra Child (versión 1.0.0)

Plugin actual: WP Cerber Security, Anti-spam, and Malware Scan (versión 9.6.7.3)

PHP versión 8.3.19

Detalles del error

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Se ha producido un error del tipo E_ERROR en la línea 842 del archivo /public_html/wp-content/plugins/wp-cerber/cerber-toolbox.php. Mensaje de error: Uncaught Error: Object of class __PHP_Incomplete_Class could not be converted to string in /public_html/wp-content/plugins/wp-cerber/cerber-toolbox.php:842

Stack trace:
#0 /public_html/wp-content/plugins/wp-cerber/cerber-toolbox.php(842): implode()
#1 /public_html/wp-content/plugins/wp-cerber/cerber-toolbox.php(921): {closure}()
#2 /public_html/wp-content/plugins/wp-cerber/admin/cerber-dashboard.php(163): cerber_issue_monitor()
#3 /public_html/wp-content/plugins/wp-cerber/admin/cerber-dashboard.php(6477): cerber_show_admin_page()
#4 /public_html/wp-includes/class-wp-hook.php(324): cerber_render_admin_page()
#5 /public_html/wp-includes/class-wp-hook.php(348): WP_Hook->apply_filters()
#6 /public_html/wp-includes/plugin.php(517): WP_Hook->do_action()
#7 /public_html/wp-admin/admin.php(259): do_action()
#8 {main}
thrown

How can I fix it?
Thanks in advance