Title: Fatal error
Last modified: March 10, 2021

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# Fatal error

 *  Resolved [fidouk](https://wordpress.org/support/users/fidouk/)
 * (@fidouk)
 * [5 years, 2 months ago](https://wordpress.org/support/topic/fatal-error-3815/)
 * Hi guys,
 * I’m getting this error when I tried to activate the plugin on my site
 * Fatal error: Declaration of Inpsyde\Debug\InpsydeDebugModule::run(Psr\Container\
   ContainerInterface $container) must be compatible with Dhii\Modular\Module\ModuleInterface::
   run(?Psr\Container\ContainerInterface $c = NULL) in /var/www/pet/wp-content/plugins/
   zettle-pos-integration/modules/inpsyde-debug/src/InpsydeDebugModule.php on line
   12

Viewing 2 replies - 1 through 2 (of 2 total)

 *  Plugin Support [Syde Niklas](https://wordpress.org/support/users/niklasinpsyde/)
 * (@niklasinpsyde)
 * [5 years, 2 months ago](https://wordpress.org/support/topic/fatal-error-3815/#post-14166013)
 * Hi [@fidouk](https://wordpress.org/support/users/fidouk/),
 * Our developers are working to fix this issue, but in the meantime, this can be
   circumvented by enabling the Zettle plugin first, and other plugins with the 
   Dhii module afterward.
    Without a system report, I can’t judge which other plugin
   might be related to the conflict. But if you disable all plugins except for WooCommerce,
   enable Zettle, and then enable all other plugins it should work. If you want 
   to share your system report privately, you can open a support ticket as described
   here: [https://zettle.inpsyde.com/docs/how-to-request-support-via-widget-on-the-website/](https://zettle.inpsyde.com/docs/how-to-request-support-via-widget-on-the-website/)
   In that case, please include a link to this thread. Thanks!
 * Kind regards,
    Niklas
 *  Plugin Support [Syde Niklas](https://wordpress.org/support/users/niklasinpsyde/)
 * (@niklasinpsyde)
 * [5 years, 1 month ago](https://wordpress.org/support/topic/fatal-error-3815/#post-14219420)
 * Closing this thread because there is a temporary workaround until the issue is
   fixed.
    This error happens when WooCommerce PayPal Payments is already active
   during the activation of Zettle POS Integration for WooCommerce. Disabling WooCommerce
   PayPal Payments, then activating Zettle POS Integration, and afterward, activating
   WooCommerce PayPal Payments again should resolve the issue for now. Our PayPal
   Payments developers are working on a fix for this behavior.
 * Kind regards,
    Niklas

Viewing 2 replies - 1 through 2 (of 2 total)

The topic ‘Fatal error’ is closed to new replies.

 * ![](https://ps.w.org/zettle-pos-integration/assets/icon-256x256.png?rev=2694076)
 * [PayPal Zettle POS for WooCommerce](https://wordpress.org/plugins/zettle-pos-integration/)
 * [Frequently Asked Questions](https://wordpress.org/plugins/zettle-pos-integration/#faq)
 * [Support Threads](https://wordpress.org/support/plugin/zettle-pos-integration/)
 * [Active Topics](https://wordpress.org/support/plugin/zettle-pos-integration/active/)
 * [Unresolved Topics](https://wordpress.org/support/plugin/zettle-pos-integration/unresolved/)
 * [Reviews](https://wordpress.org/support/plugin/zettle-pos-integration/reviews/)

 * 2 replies
 * 2 participants
 * Last reply from: [Syde Niklas](https://wordpress.org/support/users/niklasinpsyde/)
 * Last activity: [5 years, 1 month ago](https://wordpress.org/support/topic/fatal-error-3815/#post-14219420)
 * Status: resolved