Title: Cannot activate plugin Last modified: November 19, 2020 --- # Cannot activate plugin * [cvh-design](https://wordpress.org/support/users/cvh-design/) * (@cvh-design) * [5 years, 6 months ago](https://wordpress.org/support/topic/cannot-activate-plugin-64/) * When I try to activate the plugin, I get the following error: * Plugin could not be activated because it triggered a fatal error. * Fatal error: Uncaught Error: Call to undefined function _PhpScoper5f8847d7a6e47\ GuzzleHttp\choose_handler() in /html/wp-content/plugins/cf7-mollie/includes/libs/ mollie-api-php/vendor/guzzlehttp/guzzle/src/HandlerStack.php:39 Stack trace: # 0 /html/wp-content/plugins/cf7-mollie/includes/libs/mollie-api-php/src/MollieApiClient. php(257): _PhpScoper5f8847d7a6e47\GuzzleHttp\HandlerStack::create() #1 /html/ wp-content/plugins/cf7-mollie/includes/php/initialize.php(16): Mollie\Api\MollieApiClient- >__construct() #2 /html/wp-content/plugins/cf7-mollie/includes/php/webhook.php( 2): require_once(‘/html/wp-conten…’) #3 /html/wp-content/plugins/cf7-mollie/includes/ php/amount.php(2): require(‘/html/wp-conten…’) #4 /html/wp-content/plugins/cf7- mollie/cf7-mollie.php(12): require(‘/html/wp-conten…’) #5 /html/wp-admin/includes/ plugin.php(2297): include(‘/html/wp-conten…’) #6 /html/wp-admin/plugins.php(191): plugin_sandbox_scrape(‘cf7-mollie/cf7-…’) #7 {main} thrown in /html/wp-content/ plugins/cf7-mollie/includes/libs/mollie-api-php/vendor/guzzlehttp/guzzle/src/ HandlerStack.php on line 39 * What is the problem and how can I solve it? Thanks Catharina - This topic was modified 5 years, 6 months ago by [cvh-design](https://wordpress.org/support/users/cvh-design/). * The page I need help with: _[[log in](https://login.wordpress.org/?redirect_to=https%3A%2F%2Fwordpress.org%2Fsupport%2Ftopic%2Fcannot-activate-plugin-64%2F%3Foutput_format%3Dmd&locale=en_US) to see the link]_ Viewing 7 replies - 1 through 7 (of 7 total) * [Reüel](https://wordpress.org/support/users/pronamic_reuel/) * (@pronamic_reuel) * [5 years, 6 months ago](https://wordpress.org/support/topic/cannot-activate-plugin-64/#post-13687314) * I’m not sure what exactly is going on with the error, but it seems there somehow is an issue loading a commonly used software library. * If the issue persists after reinstalling the plugin, you might want to have a look at the Pronamic Pay plugin, which also supports Mollie and Contact Form 7 for one-off payments. - This reply was modified 5 years, 6 months ago by [Reüel](https://wordpress.org/support/users/pronamic_reuel/). * Plugin Author [tsjippy](https://wordpress.org/support/users/tsjippy/) * (@tsjippy) * [5 years, 5 months ago](https://wordpress.org/support/topic/cannot-activate-plugin-64/#post-13770115) * can you try to reinstall the plugin? * [jpveen](https://wordpress.org/support/users/jpveen/) * (@jpveen) * [5 years, 5 months ago](https://wordpress.org/support/topic/cannot-activate-plugin-64/#post-13829786) * Ik have a similr error: `Fatal error: Uncaught Error: Call to undefined function _PhpScoper5f8847d7a6e47\GuzzleHttp\choose_handler() in /var/www/vhosts/website. nl/httpdocs/wp-content/plugins/cf7-mollie/includes/libs/mollie-api-php/vendor/ guzzlehttp/guzzle/src/HandlerStack.php:39 Stack trace: #0 /var/www/vhosts/website. nl/httpdocs/wp-content/plugins/cf7-mollie/includes/libs/mollie-api-php/src/MollieApiClient. php(257): _PhpScoper5f8847d7a6e47\GuzzleHttp\HandlerStack::create() #1 /var/www/ vhosts/website.nl/httpdocs/wp-content/plugins/cf7-mollie/includes/php/initialize. php(16): Mollie\Api\MollieApiClient->__construct() #2 /var/www/vhosts/website. nl/httpdocs/wp-content/plugins/cf7-mollie/includes/php/webhook.php(2): require_once('/ var/www/vhosts...') #3 /var/www/vhosts/website.nl/httpdocs/wp-content/plugins/ cf7-mollie/includes/php/amount.php(2): require('/var/www/vhosts...') #4 /var/ www/vhosts/website.nl/httpdocs/wp-content/plugins/cf7-mollie/cf7-mollie.php(12): require('/var/www/vhosts...') #5 /var/www/ in /var/www/vhosts/website.nl/httpdocs/ wp-content/plugins/cf7-mollie/includes/libs/mollie-api-php/vendor/guzzlehttp/ guzzle/src/HandlerStack.php on line 39` * How can I quickly solve this? Wordpress version: 5.6 ContactForm version: 5.3.2 CF Mollie plugin version: 4.8.0 * Thanks for your quick reply!! * [eddypiv](https://wordpress.org/support/users/eddypiv/) * (@eddypiv) * [5 years, 3 months ago](https://wordpress.org/support/topic/cannot-activate-plugin-64/#post-14080885) * Similar problem here. It was a fresh install from contact form 7 and the mollie plugin. Worrying that this serious problem is still happening after 3 months? Has it been solved? What was the solution?? * [eddypiv](https://wordpress.org/support/users/eddypiv/) * (@eddypiv) * [5 years, 3 months ago](https://wordpress.org/support/topic/cannot-activate-plugin-64/#post-14080887) * I hope to get a response, as the last one raising the flag didn’t… * Plugin Author [tsjippy](https://wordpress.org/support/users/tsjippy/) * (@tsjippy) * [5 years, 3 months ago](https://wordpress.org/support/topic/cannot-activate-plugin-64/#post-14081322) * I did some ttroubleshooting. The problem occurs only when you already have installed a plugin which uses an older version of GuzzleHttp. * You should be able to activate the plugin when you deactivate all othe plugins except cf7 * [Mollie issue](https://github.com/mollie/mollie-api-php/issues/503) * [eddypiv](https://wordpress.org/support/users/eddypiv/) * (@eddypiv) * [5 years, 3 months ago](https://wordpress.org/support/topic/cannot-activate-plugin-64/#post-14081565) * Thanks [@tsjippy](https://wordpress.org/support/users/tsjippy/), I managed to activated it now, and the other plugins thereafter as well. It looks like it’s working now. Viewing 7 replies - 1 through 7 (of 7 total) The topic ‘Cannot activate plugin’ is closed to new replies. * ![](https://s.w.org/plugins/geopattern-icon/cf7-mollie.svg) * [Mollie for Contact Form 7](https://wordpress.org/plugins/cf7-mollie/) * [Frequently Asked Questions](https://wordpress.org/plugins/cf7-mollie/#faq) * [Support Threads](https://wordpress.org/support/plugin/cf7-mollie/) * [Active Topics](https://wordpress.org/support/plugin/cf7-mollie/active/) * [Unresolved Topics](https://wordpress.org/support/plugin/cf7-mollie/unresolved/) * [Reviews](https://wordpress.org/support/plugin/cf7-mollie/reviews/) * 7 replies * 5 participants * Last reply from: [eddypiv](https://wordpress.org/support/users/eddypiv/) * Last activity: [5 years, 3 months ago](https://wordpress.org/support/topic/cannot-activate-plugin-64/#post-14081565) * Status: not resolved