Plugin Activation Issues – Multisite Critical Error

Hello 10Web Team,
I hope this message finds you well. I am reporting some issues I encountered after activating your plugin. I have a multisite WordPress website. After activation of your plugin, there is a Critical Error –
Deprecated: Return type of FacebookAds\Object\ServerSide\AdsPixelSettings::offsetExists($offset) should either be compatible with ArrayAccess::offsetExists(mixed $offset): bool, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in /home/lassustandartsen/domains/lassustandartsen.nl/public_html/wp-content/plugins/official-facebook-pixel/vendor/facebook/php-business-sdk/src/FacebookAds/Object/ServerSide/AdsPixelSettings.php on line 154 Deprecated: Return type of FacebookAds\Object\ServerSide\AdsPixelSettings::offsetGet($offset) should either be compatible with ArrayAccess::offsetGet(mixed $offset): mixed, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in /home/lassustandartsen/domains/lassustandartsen.nl/public_html/wp-content/plugins/official-facebook-pixel/vendor/facebook/php-business-sdk/src/FacebookAds/Object/ServerSide/AdsPixelSettings.php on line 163 Deprecated: Return type of FacebookAds\Object\ServerSide\AdsPixelSettings::offsetSet($offset, $value) should either be compatible with ArrayAccess::offsetSet(mixed $offset, mixed $value): void, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in /home/lassustandartsen/domains/lassustandartsen.nl/public_html/wp-content/plugins/official-facebook-pixel/vendor/facebook/php-business-sdk/src/FacebookAds/Object/ServerSide/AdsPixelSettings.php on line 173 Deprecated: Return type of FacebookAds\Object\ServerSide\AdsPixelSettings::offsetUnset($offset) should either be compatible with ArrayAccess::offsetUnset(mixed $offset): void, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in /home/lassustandartsen/domains/lassustandartsen.nl/public_html/wp-content/plugins/official-facebook-pixel/vendor/facebook/php-business-sdk/src/FacebookAds/Object/ServerSide/AdsPixelSettings.php on line 186 Fatal error: Uncaught TypeError: call_user_func_array(): Argument #1 ($callback) must be a valid callback, class “\TenWebOptimizer\OptimizerAdmin” not found in /home/lassustandartsen/domains/lassustandartsen.nl/public_html/wp-includes/class-wp-hook.php:308 Stack trace: #0 /home/lassustandartsen/domains/lassustandartsen.nl/public_html/wp-includes/class-wp-hook.php(332): WP_Hook->apply_filters() #1 /home/lassustandartsen/domains/lassustandartsen.nl/public_html/wp-includes/plugin.php(517): WP_Hook->do_action() #2 /home/lassustandartsen/domains/lassustandartsen.nl/public_html/wp-admin/admin-header.php(118): do_action() #3 /home/lassustandartsen/domains/lassustandartsen.nl/public_html/wp-admin/plugins.php(605): require_once(‘…’) #4 /home/lassustandartsen/domains/lassustandartsen.nl/public_html/wp-admin/network/plugins.php(13): require(‘…’) #5 {main} thrown in /home/lassustandartsen/domains/lassustandartsen.nl/public_html/wp-includes/class-wp-hook.php on line 308

After the deactivation of the Facebook Pixel plugin, there is another critical error –
Fatal error: Uncaught TypeError: call_user_func_array(): Argument #1 ($callback) must be a valid callback, class “\TenWebOptimizer\OptimizerAdmin” not found in /home/lassustandartsen/domains/lassustandartsen.nl/public_html/wp-includes/class-wp-hook.php:308 Stack trace: #0 /home/lassustandartsen/domains/lassustandartsen.nl/public_html/wp-includes/class-wp-hook.php(332): WP_Hook->apply_filters() #1 /home/lassustandartsen/domains/lassustandartsen.nl/public_html/wp-includes/plugin.php(517): WP_Hook->do_action() #2 /home/lassustandartsen/domains/lassustandartsen.nl/public_html/wp-admin/admin-header.php(118): do_action() #3 /home/lassustandartsen/domains/lassustandartsen.nl/public_html/wp-admin/plugins.php(605): require_once(‘…’) #4 /home/lassustandartsen/domains/lassustandartsen.nl/public_html/wp-admin/network/plugins.php(13): require(‘…’) #5 {main} thrown in /home/lassustandartsen/domains/lassustandartsen.nl/public_html/wp-includes/class-wp-hook.php on line 308

Could you please help me we that?
Please guide how to resolve these issues. Your support would be greatly appreciated.
Thank you in advance, and I look forward to hearing from you soon.
Best regards,