Title: GuzzleHTTP Error
Last modified: September 19, 2022

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# GuzzleHTTP Error

 *  Resolved [huxxco](https://wordpress.org/support/users/huxxco/)
 * (@huxxco)
 * [3 years, 8 months ago](https://wordpress.org/support/topic/guzzlehttp-error-3/)
 * We’re running into a conflict between Fluent SMTP and another plugin over GuzzleHTTP
   versions that’s causing fatal PHP errors. What version of GuzzleHTTP is this 
   plugin using?

Viewing 4 replies - 1 through 4 (of 4 total)

 *  Plugin Support [Amimul Ihsan](https://wordpress.org/support/users/amimulihsanmahdi/)
 * (@amimulihsanmahdi)
 * [3 years, 8 months ago](https://wordpress.org/support/topic/guzzlehttp-error-3/#post-16029570)
 * Hello [@huxxco](https://wordpress.org/support/users/huxxco/),
 * Would you please inform us what error you are getting so that we can take a further
   look?
 * Let me know the update.
 * Thank you
 *  Thread Starter [huxxco](https://wordpress.org/support/users/huxxco/)
 * (@huxxco)
 * [3 years, 8 months ago](https://wordpress.org/support/topic/guzzlehttp-error-3/#post-16029884)
 * [@amimulihsanmahdi](https://wordpress.org/support/users/amimulihsanmahdi/) Absolutely.
   Here you go:
 * `Uncaught Error: Call to undefined function GuzzleHttp\choose_handler() in /home/
   example.com/public_html/wp-content/plugins/fluent-smtp/includes/libs/google-api-
   client/vendor/guzzlehttp/guzzle/src/HandlerStack.php:40`
 * Using Fluent SMTP v2.2.0
 *  Plugin Support [Amimul Ihsan](https://wordpress.org/support/users/amimulihsanmahdi/)
 * (@amimulihsanmahdi)
 * [3 years, 8 months ago](https://wordpress.org/support/topic/guzzlehttp-error-3/#post-16034285)
 * Hello there,
 * Would you please deactivate, delete the plugin and reinstall it from the scratch?
 * Let me know the update.
 * Thank you
 *  Thread Starter [huxxco](https://wordpress.org/support/users/huxxco/)
 * (@huxxco)
 * [3 years, 8 months ago](https://wordpress.org/support/topic/guzzlehttp-error-3/#post-16034423)
 * I’ve tried this a few times now. Attempted again just now and same result, unfortunately.
   Deactivated, deleted, reinstalled from WP repository (Plugins > Add New).
    -  This reply was modified 3 years, 8 months ago by [huxxco](https://wordpress.org/support/users/huxxco/).

Viewing 4 replies - 1 through 4 (of 4 total)

The topic ‘GuzzleHTTP Error’ is closed to new replies.

 * ![](https://ps.w.org/fluent-smtp/assets/icon.svg?rev=2458343)
 * [FluentSMTP - WP SMTP Plugin with Amazon SES, SendGrid, MailGun, Postmark, Google and Any SMTP Provider](https://wordpress.org/plugins/fluent-smtp/)
 * [Frequently Asked Questions](https://wordpress.org/plugins/fluent-smtp/#faq)
 * [Support Threads](https://wordpress.org/support/plugin/fluent-smtp/)
 * [Active Topics](https://wordpress.org/support/plugin/fluent-smtp/active/)
 * [Unresolved Topics](https://wordpress.org/support/plugin/fluent-smtp/unresolved/)
 * [Reviews](https://wordpress.org/support/plugin/fluent-smtp/reviews/)

 * 4 replies
 * 2 participants
 * Last reply from: [huxxco](https://wordpress.org/support/users/huxxco/)
 * Last activity: [3 years, 8 months ago](https://wordpress.org/support/topic/guzzlehttp-error-3/#post-16034423)
 * Status: resolved