Title: Fatal Error on API setup
Last modified: May 11, 2021

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# Fatal Error on API setup

 *  Resolved [newpadmin](https://wordpress.org/support/users/newpadmin/)
 * (@newpadmin)
 * [5 years ago](https://wordpress.org/support/topic/fatal-error-on-api-setup/)
 * Hi,
 * We get this fatal error when we try to connect or account with the API keys:
 * `Fatal error: Uncaught Error: Call to undefined method Mailjet\Client::addRequestOption()
   in /public_html/wp-content/plugins/mailjet-for-wordpress/src/includes/MailjetApi.
   php:38 Stack trace: #0 /public_html/wp-content/plugins/mailjet-for-wordpress/
   src/includes/MailjetApi.php(354): MailjetPlugin\Includes\MailjetApi::getApiClient()#
   1 /public_html/wp-content/plugins/mailjet-for-wordpress/src/includes/SettingsPages/
   InitialSettings.php(118): MailjetPlugin\Includes\MailjetApi::isValidAPICredentials()#
   2 /public_html/wp-includes/class-wp-hook.php(287): MailjetPlugin\Includes\SettingsPages\
   InitialSettings->mailjet_initial_settings_page_html('') #3 /public_html/wp-includes/
   class-wp-hook.php(311): WP_Hook->apply_filters('', Array) #4 /home/customer/www/
   petitsioux.com/public_html/wp-includes/plugin.php(484): WP_Hook->do_action(Array)#
   5 / in /public_html/wp-content/plugins/mailjet-for-wordpress/src/includes/MailjetApi.
   php on line 38`
 * Can you help us with that ?
 * WordPress version 5.6.3
    Theme : Enfold-theme-enfant (version ) Extension : Mailjet
   for WordPress (version 5.2.6) PHP version 7.3.27

The topic ‘Fatal Error on API setup’ is closed to new replies.

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## Tags

 * [fatal error](https://wordpress.org/support/topic-tag/fatal-error/)

 * 0 replies
 * 1 participant
 * Last reply from: [newpadmin](https://wordpress.org/support/users/newpadmin/)
 * Last activity: [5 years ago](https://wordpress.org/support/topic/fatal-error-on-api-setup/)
 * Status: resolved