Title: WooCommerce Error Last modified: May 20, 2020 --- # WooCommerce Error * Resolved [morganelite](https://wordpress.org/support/users/morganelite/) * (@morganelite) * [5 years, 11 months ago](https://wordpress.org/support/topic/woocommerce-error-26/) * I received the following error message: * PHP Fatal error: Uncaught Error: Call to undefined function is_checkout() in / home/ _______/wp-content/plugins/woo-checkout-field-editor-pro/classes/class- thwcfd-checkout.php:22 Viewing 8 replies - 1 through 8 (of 8 total) * Thread Starter [morganelite](https://wordpress.org/support/users/morganelite/) * (@morganelite) * [5 years, 11 months ago](https://wordpress.org/support/topic/woocommerce-error-26/#post-12867136) * I was unable to access the WP dashboard – hosting company turned off the WooCommerce in order for me to regain access. * Do you think restoring the site to a previous backup would resolve this? * Thread Starter [morganelite](https://wordpress.org/support/users/morganelite/) * (@morganelite) * [5 years, 11 months ago](https://wordpress.org/support/topic/woocommerce-error-26/#post-12867144) * Additional information: * Hosting company is saying the issue is with the WooCommerce plugin. I noticed that there was an upload about 4 hours ago. * Plugin Support [Fernando a11n](https://wordpress.org/support/users/fhaps/) * (@fhaps) * Automattic Happiness Engineer * [5 years, 11 months ago](https://wordpress.org/support/topic/woocommerce-error-26/#post-12867231) * [@morganelite](https://wordpress.org/support/users/morganelite/) Issues like this are most often caused by conflicts. Disabling plugins will usually bring the site back on, but re-enabling the conflicting plugin will cause the error to pop up again. * These issues can be caused by a specific combination of plugins. So, for example, a plugin that adds functionality to the main WooCommerce plugin may be the culprit, but deactivating the WooCommerce plugin would also disable the functionality of that second plugin, thus giving the appearance of the issue being solved. * The error you shared above those references this plugin: `woo-checkout-field- editor-pro`. So that would be a great place to start testing. If you disable this plugin, does the issue go away? * If that doesn’t solve the issue, what you’ll want to do to find out which plugin is the true culprit, is run a full conflict test. You’ll want to temporarily switch your theme to Storefront. Then, disable all plugins on the site except for WooCommerce, and test for the issue. * If the site works correctly under that default setup, you’ll then have to re- enable features one by one, while testing for the issue; until you find out which one is causing this behavior. If the site crashes again, you’ll know that the last plugin to be updated is what’s causing the issue. * We recommend that these steps are taken on a staging site, which is a clone of your live site that you can modify without risking making any permanent damage to your live site. You can create it using a plugin like [WP-Staging](https://wordpress.org/plugins/wp-staging/). * Thread Starter [morganelite](https://wordpress.org/support/users/morganelite/) * (@morganelite) * [5 years, 11 months ago](https://wordpress.org/support/topic/woocommerce-error-26/#post-12867329) * [@fhaps](https://wordpress.org/support/users/fhaps/) Thank you very much for all your input and help with this. The hosting company finally listened to me and deleted the WooCommerce directory. I was able to reinstall the WooCommerce plugin but I am afraid to touch anything. I’m building this site for my aunt and feel like I might mess up again. Thanks for all your help. * Thread Starter [morganelite](https://wordpress.org/support/users/morganelite/) * (@morganelite) * [5 years, 11 months ago](https://wordpress.org/support/topic/woocommerce-error-26/#post-12867342) * [@fhaps](https://wordpress.org/support/users/fhaps/) The WP Staging plugin states it has not been tested with my version of WP. WP 5.4.1 This is the version my hosting company installed. Should I have a different version? * Thread Starter [morganelite](https://wordpress.org/support/users/morganelite/) * (@morganelite) * [5 years, 11 months ago](https://wordpress.org/support/topic/woocommerce-error-26/#post-12867358) * [@fhaps](https://wordpress.org/support/users/fhaps/) – I just activated the woo- checkout-field-editor but nothing else. I noticed that the error you pointed out states “PRO” I do not have the pro version. Could the field or fields be searching for the PRO version of the plugin and this is why it is causing the error? * Also would this type of error prevent me from accessing my WP dashboard? Earlier prior to contacting my hosting company I was unable to access the WP dashboard, but was able to manually navigate to non-woocommerce pages * [Luminus Alabi](https://wordpress.org/support/users/luminus/) * (@luminus) * Automattic Happiness Engineer * [5 years, 11 months ago](https://wordpress.org/support/topic/woocommerce-error-26/#post-12867962) * [@morganelite](https://wordpress.org/support/users/morganelite/), * > The WP Staging plugin states it has not been tested with my version of WP. > WP 5.4.1 This is the version my hosting company installed. Should I have a > different version? * That’s the most recent version of WordPress and therefore the one that you should have. I’d recommend that you go ahead and create that staging site unless your hosting company has staging site capability available to you. * > I just activated the woo-checkout-field-editor but nothing else. I noticed > that the error you pointed out states “PRO” I do not have the pro version. > Could the field or fields be searching for the PRO version of the plugin and > this is why it is causing the error? * This is the slug for the plugin regardless of whether you have the premium version or not. You can reach the developers of the plugin for support by opening a thread here – [https://wordpress.org/support/plugin/woo-checkout-field-editor-pro/](https://wordpress.org/support/plugin/woo-checkout-field-editor-pro/) * [Luminus Alabi](https://wordpress.org/support/users/luminus/) * (@luminus) * Automattic Happiness Engineer * [5 years, 11 months ago](https://wordpress.org/support/topic/woocommerce-error-26/#post-12892539) * Hi [@morganelite](https://wordpress.org/support/users/morganelite/). * We haven’t heard back from you in a while, so I’m going to mark this as resolved– if you have any further questions, you can start a new thread. Viewing 8 replies - 1 through 8 (of 8 total) The topic ‘WooCommerce Error’ is closed to new replies. * ![](https://ps.w.org/woocommerce/assets/icon.svg?rev=3234504) * [WooCommerce](https://wordpress.org/plugins/woocommerce/) * [Frequently Asked Questions](https://wordpress.org/plugins/woocommerce/#faq) * [Support Threads](https://wordpress.org/support/plugin/woocommerce/) * [Active Topics](https://wordpress.org/support/plugin/woocommerce/active/) * [Unresolved Topics](https://wordpress.org/support/plugin/woocommerce/unresolved/) * [Reviews](https://wordpress.org/support/plugin/woocommerce/reviews/) * 8 replies * 3 participants * Last reply from: [Luminus Alabi](https://wordpress.org/support/users/luminus/) * Last activity: [5 years, 11 months ago](https://wordpress.org/support/topic/woocommerce-error-26/#post-12892539) * Status: resolved