The message appears in files of the plugin “The Courier Guy Shipping for WooCommerce”. I would recommend contacting their support forum: https://wordpress.org/support/plugin/the-courier-guy/
Hello @lilybabydoll1873,
I hope things are going well for you.
I tried installing the https://wordpress.org/plugins/the-courier-guy on my Local WP site with Nginx / PHP 8.2.27 / MySQL 8.0.35 database and WordPress 6.9-RC2-61266 Beta. I couldn’t replicate the issue with the plugin, which suggests there is no problem with the plugin itself, but it could be conflicts with other plugins.
For example, the issue is more likely that another plugin is loading a different Guzzle version, which seems to cause a conflict.
Here, I recommend a full conflict test to narrow it down. I see that currently the site is live, which seems maybe you’re getting to backend pages, the critical error.
0. If your hosting offers a staging service, then create it and conduct the remaining steps there.
1. Create an entire site backup for safety
2. Deactivate all the plugins.
3. Deactivate the current theme and set the WordPress default theme.
4. To ensure that all the plugins and themes are deactivated, whether the issue reproduces or not. If not, then.
5. Reactivate the theme and check whether the error reproduces. If not, keep reactivating the plugin until it produces the error.
6. The last activated plugin will be causing the issue.
Here is the conflict test documentation, which you can refer to if you feel stuck while doing a conflict test.
https://wpmudev.com/docs/getting-started/getting-support/#conflict-test
https://wpmudev.com/wp-content/uploads/2015/09/Support-Process-Support-Process.gif`
Feel free to conduct the test and share the outcome with us.
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Kind Regards,
Imran Khan