Can't activate or deactivate modules

I’m sorry to hear you’ve run into issues.

Could you check your server error logs around the time when you experienced the issue, to find out more about the error?

If you don’t know how to access your server error logs, your hosting provider should be able to help.

Let me know how it goes.

Yes, there is an error. I find this in error log

PHP Fatal error: Call to undefined method Jetpack::is_staging_site() in /home1/mysite/public_html/wp-content/plugins/jetpack/class.jetpack-sync.php on line 173

I don’t know what is this.

It seems that you’re missing some of the updates that were made to the last version of Jetpack.

Could you try to log in to your site via FTP or CPanel, and delete the existing Jetpack plugin folder, and reinstall the plugin manually as explained here:
https://codex.www.ads-software.com/Managing_Plugins#Manual_Plugin_Installation

You’ll find the Jetpack plugin folder here:

wp-content
   plugins
     jetpack - DELETE THIS FOLDER

If you’re not sure how to do this, you can ask your hosting company for help. They should also have documentation explaining how to edit or remove files from your site using FTP or a File Manager in your admin panel.

Let me know how it goes.

Thanks @jeremy
After delete and reinstall, all is going right.
Lot of thanks.