Hi @cuongpham259
probably, the plugin Zender SMS has some code that depends on some functions or classes that are defined in WooCommerce, and it checks the presence of WooCommerce in the wrong way.
The clean solution can be given only by the authors of Zender SMS.
I suggest you write them and ask why their plugin depends on WooCommerce, and if they can check the presence of the functions or classes of WooCommerce that they are using instead of checking if WooCommerce is active.
You can give them the link to our contact form if they need help: https://freesoul-deactivate-plugins.com/contact/
As a temporary solution you can try to add this line of code in wp-config.php before the comment /* That’s all, stop editing! Happy publishing. */:
define( 'FDP_REMOVE_FILTERS_BEFORE_FIRST_PLUGIN',true );
If you solve the issue, check all your website to see that all works right. As said the clean solution will be in any case an update of the code of Zender SMS. After they do it, remove the line of code above, because in the future you may have some plugins that give problems if you have that line of code in wp-config.php.
I hope it helps
Have a great day!
Jose