Title: Errors after hosting switch
Last modified: March 5, 2025

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# Errors after hosting switch

 *  [Nosferatumax](https://wordpress.org/support/users/nosferatumax/)
 * (@nosferatumax)
 * [1 year, 3 months ago](https://wordpress.org/support/topic/errors-after-hosting-switch/)
 * **Hello Support Team,**
 * I recently migrated my website to a new server, and after the move, I encountered
   an issue when activating the WebP Express plugin. The site becomes non-functional
   upon activation, which was not the case on the previous server.
 * I have verified that all configurations, including the PHP version, remain unchanged.
   However, I am seeing the following fatal error in the logs:
 * Fatal error: Uncaught Error: Call to undefined function WebPExpress\is_executable()
   
   in /www/hosting/nailsmaterial.cz/www/wp-content/plugins/webp-express/lib/classes/
   FileHelper.php:155Stack trace: 0 /www/hosting/nailsmaterial.cz/www/wp-content/
   plugins/webp-express/lib/classes/TestRun.php(63): WebPExpress\FileHelper::canCreateFile()
   1 /www/hosting/nailsmaterial.cz/www/wp-content/plugins/webp-express/lib/classes/
   Config.php(297): WebPExpress\TestRun::getConverterStatus() 2 /www/hosting/nailsmaterial.
   cz/www/wp-content/plugins/webp-express/lib/classes/Config.php(382): WebPExpress\
   Config::updateConverterStatusWithFreshTest() 3 /www/hosting/nailsmaterial.cz/
   www/wp-content/plugins/webp-express/lib/options/enqueue_scripts.php(35): WebPExpress\
   Config::getConfigForOptionsPage() 4 /www/hosting/nailsmaterial.cz/www/wp-content/
   plugins/webp-express/lib/classes/OptionsPage.php(18): include(‘…’) 5 /www/hosting/
   nailsmaterial.cz/www/wp-includes/class-wp-hook.php(324): WebPExpress\OptionsPage::
   enqueueScripts() 6 /www/hosting/nailsmaterial.cz/www/wp-includes/class-wp-hook.
   php(348): WP_Hook->apply_filters() 7 /www/hosting/nailsmaterial.cz/www/wp-includes/
   plugin.php(517): WP_Hook->do_action() 8 /www/hosting/nailsmaterial.cz/www/wp-
   admin/admin-header.php(118): do_action() 9 /www/hosting/nailsmaterial.cz/www/
   wp-admin/admin.php(239): require_once(‘…’) 10 /www/hosting/nailsmaterial.cz/www/
   wp-admin/options-general.php(10): require_once(‘…’) 11 {main} thrown in /www/
   hosting/nailsmaterial.cz/www/wp-content/plugins/webp-express/lib/classes/FileHelper.
   php on line 155
 * Could you please advise on how to resolve this issue? What steps should I take
   to fix it?
 * Looking forward to your guidance.
 * Best regards,
 * The page I need help with: _[[log in](https://login.wordpress.org/?redirect_to=https%3A%2F%2Fwordpress.org%2Fsupport%2Ftopic%2Ferrors-after-hosting-switch%2F%3Foutput_format%3Dmd&locale=en_US)
   to see the link]_

The topic ‘Errors after hosting switch’ is closed to new replies.

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 * [WebP Express](https://wordpress.org/plugins/webp-express/)
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 * 0 replies
 * 1 participant
 * Last reply from: [Nosferatumax](https://wordpress.org/support/users/nosferatumax/)
 * Last activity: [1 year, 3 months ago](https://wordpress.org/support/topic/errors-after-hosting-switch/)
 * Status: not resolved