Thanks so much, that fixed it.

How to fix This section allows you to activate, deactivate, and manage the plugins that you have uploaded to your forum's inc/plugins directory. To hide a plugin from view, but not lose any stored information from it, click the Deactivate link.????

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how to fix " This section allows you to activate, deactivate, and manage the plugins that you have uploaded to your forum's inc/plugins directory. To hide a plugin from view, but not lose any stored information from it, click the Deactivate link." I accidentally pressed deactivate whisper, help me!fast!

Go to Home > Configuration and update your personal admin settings to hold the Default theme. Then, reinstall Whisper.

still there is no change.

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how to fix the plugin does not appear?

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my plugin error

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like this guy's example picture @ Vulpus Maximus

What PHP version are you using?

PHP 5.6.35 and MySQLi 10.1.32.

hey dude how to fix it??

Go to your database manager, and run:

UPDATE mybb_adminoptions SET cpstyle = 'default'

Replace "mybb_" with your table prefix. This will revert all admins to use the default style. You can then proceed to install Whisper again.

Got this error when I installed Whisper ACP.
Fatal error: Uncaught Error: [] operator not supported for strings in /home/h******l/public_html/main/styles/Whisper/style.php:283 Stack trace: /home/h******l/public_html/main/modules/config/plugins.php(501): Page->output_nav_tabs(Array, 'plugins') #1 /home/h******l/public_html/main/index.php(821): require('/home/h******l/...') #2 {main} thrown in /home/h******l/public_html/main/styles/Whisper/style.php on line 283

NOTE: h******l was purposely "blanked out" to protect my website.

PHP 5.4 is a minimum requirement.