Title: Warning when activating this plugin Last modified: February 10, 2018 --- # Warning when activating this plugin * [Denis Žoljom](https://wordpress.org/support/users/dingo_d/) * (@dingo_d) * [8 years, 3 months ago](https://wordpress.org/support/topic/warning-when-activating-this-plugin/) * Hi! * I am using this plugin (should be the official one which was recommended by Corvus) and when I activated it I got this error: * `Notice: register_uninstall_hook was called incorrectly. Only a static class method or function can be used in an uninstall hook. Please see Debugging in WordPress for more information. (This message was added in version 3.1.0.) in public_html/wp-includes/functions.php on line 4147` * `Warning: Cannot modify header information - headers already sent by (output started at public_html/wp-includes/functions.php:4147) in public_html/wp-admin/ includes/misc.php on line 1114` * I’ve tried disabling all the other plugins I have on site, and only this one is making this notice and warning. * I’m on latest WordPress and using the latest version of WooCommerce. * Can you fix this issue? Viewing 4 replies - 1 through 4 (of 4 total) * [filoveg](https://wordpress.org/support/users/filoveg/) * (@filoveg) * [8 years, 1 month ago](https://wordpress.org/support/topic/warning-when-activating-this-plugin/#post-10193703) * +1 * Thread Starter [Denis Žoljom](https://wordpress.org/support/users/dingo_d/) * (@dingo_d) * [8 years, 1 month ago](https://wordpress.org/support/topic/warning-when-activating-this-plugin/#post-10229347) * I cloned the client site locally where I have Xdebug on and I got the more detailed error * ``` [29-Apr-2018 09:01:53 UTC] PHP Notice: register_uninstall_hook was called incorrectly. Only a static class method or function can be used in an uninstall hook. Please see Debugging in WordPress for more information. (This message was added in version 3.1.0.) in /public_html/wp-includes/functions.php on line 4147 [29-Apr-2018 09:01:53 UTC] PHP Stack trace: [29-Apr-2018 09:01:53 UTC] PHP 1. {main}() /public_html/wp-admin/plugins.php:0 [29-Apr-2018 09:01:53 UTC] PHP 2. require_once() /public_html/wp-admin/plugins.php:10 [29-Apr-2018 09:01:53 UTC] PHP 3. require_once() /public_html/wp-admin/admin.php:31 [29-Apr-2018 09:01:53 UTC] PHP 4. require_once() /public_html/wp-load.php:37 [29-Apr-2018 09:01:53 UTC] PHP 5. require_once() /public_html/wp-config.php:91 [29-Apr-2018 09:01:53 UTC] PHP 6. include_once() /public_html/wp-settings.php:305 [29-Apr-2018 09:01:53 UTC] PHP 7. Cpsi_Init->__construct() /public_html/wp-content/plugins/corvuspay-woocommerce-integration/cpsi.php:302 [29-Apr-2018 09:01:53 UTC] PHP 8. register_uninstall_hook($file = '/public_html/wp-content/plugins/corvuspay-woocommerce-integration/cpsi.php', $callback = array (0 => class Cpsi_Init { protected $classesAreLoaded = FALSE }, 1 => 'uninstall')) /public_html/wp-content/plugins/corvuspay-woocommerce-integration/cpsi.php:206 [29-Apr-2018 09:01:53 UTC] PHP 9. _doing_it_wrong($function = 'register_uninstall_hook', $message = 'Only a static class method or function can be used in an uninstall hook.', $version = '3.1.0') /public_html/wp-includes/plugin.php:810 [29-Apr-2018 09:01:53 UTC] PHP 10. trigger_error('register_uninstall_hook was called incorrectly. Only a static class method or function can be used in an uninstall hook. Please see Debugging in WordPress for more information. (This message was added in version 3.1.0.)') /public_html/wp-includes/functions.php:4147 [29-Apr-2018 09:02:57 UTC] PHP Notice: register_uninstall_hook was called incorrectly. Only a static class method or function can be used in an uninstall hook. Please see Debugging in WordPress for more information. (This message was added in version 3.1.0.) in /public_html/wp-includes/functions.php on line 4147 [29-Apr-2018 09:02:57 UTC] PHP Stack trace: [29-Apr-2018 09:02:57 UTC] PHP 1. {main}() /public_html/wp-admin/admin-ajax.php:0 [29-Apr-2018 09:02:57 UTC] PHP 2. require_once() /public_html/wp-admin/admin-ajax.php:22 [29-Apr-2018 09:02:57 UTC] PHP 3. require_once() /public_html/wp-load.php:37 [29-Apr-2018 09:02:57 UTC] PHP 4. require_once() /public_html/wp-config.php:91 [29-Apr-2018 09:02:57 UTC] PHP 5. include_once() /public_html/wp-settings.php:305 [29-Apr-2018 09:02:57 UTC] PHP 6. Cpsi_Init->__construct() /public_html/wp-content/plugins/corvuspay-woocommerce-integration/cpsi.php:302 [29-Apr-2018 09:02:57 UTC] PHP 7. register_uninstall_hook($file = '/public_html/wp-content/plugins/corvuspay-woocommerce-integration/cpsi.php', $callback = array (0 => class Cpsi_Init { protected $classesAreLoaded = FALSE }, 1 => 'uninstall')) /public_html/wp-content/plugins/corvuspay-woocommerce-integration/cpsi.php:206 [29-Apr-2018 09:02:57 UTC] PHP 8. _doing_it_wrong($function = 'register_uninstall_hook', $message = 'Only a static class method or function can be used in an uninstall hook.', $version = '3.1.0') /public_html/wp-includes/plugin.php:810 [29-Apr-2018 09:02:57 UTC] PHP 9. trigger_error('register_uninstall_hook was called incorrectly. Only a static class method or function can be used in an uninstall hook. Please see Debugging in WordPress for more information. (This message was added in version 3.1.0.)') /public_html/wp-includes/functions.php:4147 ``` * Hope this helps. * Thread Starter [Denis Žoljom](https://wordpress.org/support/users/dingo_d/) * (@dingo_d) * [8 years, 1 month ago](https://wordpress.org/support/topic/warning-when-activating-this-plugin/#post-10231680) * Some additional notices I’m getting in the debug log: * ``` [30-Apr-2018 08:16:58 UTC] PHP Notice: Trying to get property of non-object in public_html/wp-content/plugins/corvuspay-woocommerce-integration/classes.php on line 531 [30-Apr-2018 08:16:58 UTC] PHP Warning: strpos(): Empty needle in public_html/wp-content/plugins/corvuspay-woocommerce-integration/classes.php on line 532 [30-Apr-2018 08:16:58 UTC] PHP Notice: id je neispravno pozvan. Order properties should not be accessed directly. Backtrace: require('wp-blog-header.php'), require_once('wp-includes/template-loader.php'), include('/themes/stockholm/page.php'), the_content, apply_filters('the_content'), WP_Hook->apply_filters, call_user_func_array, do_shortcode, preg_replace_callback, do_shortcode_tag, call_user_func, Cpsi_Init->executeShortcode, Cpsi_Shortcodes->runShortcode, Cpsi_Shortcodes->corvusPayCheckout, Cpsi_Shortcodes->_buildRedirectToPaymentGwForm, WC_Abstract_Legacy_Order->__get, wc_doing_it_wrong Pročitajte Debugging in WordPress za više informacija. (Ova poruka je dodana u inačici 3.0.) in public_html/wp-includes/functions.php on line 4147 [30-Apr-2018 08:16:58 UTC] PHP Notice: Trying to get property of non-object in public_html/wp-content/plugins/corvuspay-woocommerce-integration/classes.php on line 411 PHP Notice: billing_first_name je neispravno pozvan. Order properties should not be accessed directly. Backtrace: require('wp-blog-header.php'), require_once('wp-includes/template-loader.php'), include('/themes/stockholm/page.php'), the_content, apply_filters('the_content'), WP_Hook->apply_filters, call_user_func_array, do_shortcode, preg_replace_callback, do_shortcode_tag, call_user_func, Cpsi_Init->executeShortcode, Cpsi_Shortcodes->runShortcode, Cpsi_Shortcodes->corvusPayCheckout, Cpsi_Shortcodes->_buildRedirectToPaymentGwForm, Cpsi_Shortcodes->_setOptionalFormFields, WC_Abstract_Legacy_Order->__get, wc_doing_it_wrong Pročitajte Debugging in WordPress za više informacija. (Ova poruka je dodana u inačici 3.0.) in public_html/wp-includes/functions.php on line 4147 [30-Apr-2018 08:16:58 UTC] PHP Notice: billing_last_name je neispravno pozvan. Order properties should not be accessed directly. Backtrace: require('wp-blog-header.php'), require_once('wp-includes/template-loader.php'), include('/themes/stockholm/page.php'), the_content, apply_filters('the_content'), WP_Hook->apply_filters, call_user_func_array, do_shortcode, preg_replace_callback, do_shortcode_tag, call_user_func, Cpsi_Init->executeShortcode, Cpsi_Shortcodes->runShortcode, Cpsi_Shortcodes->corvusPayCheckout, Cpsi_Shortcodes->_buildRedirectToPaymentGwForm, Cpsi_Shortcodes->_setOptionalFormFields, WC_Abstract_Legacy_Order->__get, wc_doing_it_wrong Pročitajte Debugging in WordPress za više informacija. (Ova poruka je dodana u inačici 3.0.) in public_html/wp-includes/functions.php on line 4147 [30-Apr-2018 08:16:58 UTC] PHP Notice: billing_country je neispravno pozvan. Order properties should not be accessed directly. Backtrace: require('wp-blog-header.php'), require_once('wp-includes/template-loader.php'), include('/themes/stockholm/page.php'), the_content, apply_filters('the_content'), WP_Hook->apply_filters, call_user_func_array, do_shortcode, preg_replace_callback, do_shortcode_tag, call_user_func, Cpsi_Init->executeShortcode, Cpsi_Shortcodes->runShortcode, Cpsi_Shortcodes->corvusPayCheckout, Cpsi_Shortcodes->_buildRedirectToPaymentGwForm, Cpsi_Shortcodes->_setOptionalFormFields, WC_Abstract_Legacy_Order->__get, wc_doing_it_wrong Pročitajte Debugging in WordPress za više informacija. (Ova poruka je dodana u inačici 3.0.) in public_html/wp-includes/functions.php on line 4147 [30-Apr-2018 08:16:58 UTC] PHP Notice: billing_email je neispravno pozvan. Order properties should not be accessed directly. Backtrace: require('wp-blog-header.php'), require_once('wp-includes/template-loader.php'), include('/themes/stockholm/page.php'), the_content, apply_filters('the_content'), WP_Hook->apply_filters, call_user_func_array, do_shortcode, preg_replace_callback, do_shortcode_tag, call_user_func, Cpsi_Init->executeShortcode, Cpsi_Shortcodes->runShortcode, Cpsi_Shortcodes->corvusPayCheckout, Cpsi_Shortcodes->_buildRedirectToPaymentGwForm, Cpsi_Shortcodes->_setOptionalFormFields, WC_Abstract_Legacy_Order->__get, wc_doing_it_wrong Pročitajte Debugging in WordPress za više informacija. (Ova poruka je dodana u inačici 3.0.) in public_html/wp-includes/functions.php on line 4147 [30-Apr-2018 08:16:58 UTC] PHP Notice: billing_phone je neispravno pozvan. Order properties should not be accessed directly. Backtrace: require('wp-blog-header.php'), require_once('wp-includes/template-loader.php'), include('/themes/stockholm/page.php'), the_content, apply_filters('the_content'), WP_Hook->apply_filters, call_user_func_array, do_shortcode, preg_replace_callback, do_shortcode_tag, call_user_func, Cpsi_Init->executeShortcode, Cpsi_Shortcodes->runShortcode, Cpsi_Shortcodes->corvusPayCheckout, Cpsi_Shortcodes->_buildRedirectToPaymentGwForm, Cpsi_Shortcodes->_setOptionalFormFields, WC_Abstract_Legacy_Order->__get, wc_doing_it_wrong Pročitajte Debugging in WordPress za više informacija. (Ova poruka je dodana u inačici 3.0.) in public_html/wp-includes/functions.php on line 4147 [30-Apr-2018 08:16:58 UTC] PHP Notice: billing_city je neispravno pozvan. Order properties should not be accessed directly. Backtrace: require('wp-blog-header.php'), require_once('wp-includes/template-loader.php'), include('/themes/stockholm/page.php'), the_content, apply_filters('the_content'), WP_Hook->apply_filters, call_user_func_array, do_shortcode, preg_replace_callback, do_shortcode_tag, call_user_func, Cpsi_Init->executeShortcode, Cpsi_Shortcodes->runShortcode, Cpsi_Shortcodes->corvusPayCheckout, Cpsi_Shortcodes->_buildRedirectToPaymentGwForm, Cpsi_Shortcodes->_setOptionalFormFields, WC_Abstract_Legacy_Order->__get, wc_doing_it_wrong Pročitajte Debugging in WordPress za više informacija. (Ova poruka je dodana u inačici 3.0.) in public_html/wp-includes/functions.php on line 4147 [30-Apr-2018 08:16:58 UTC] PHP Notice: billing_address_1 je neispravno pozvan. Order properties should not be accessed directly. Backtrace: require('wp-blog-header.php'), require_once('wp-includes/template-loader.php'), include('/themes/stockholm/page.php'), the_content, apply_filters('the_content'), WP_Hook->apply_filters, call_user_func_array, do_shortcode, preg_replace_callback, do_shortcode_tag, call_user_func, Cpsi_Init->executeShortcode, Cpsi_Shortcodes->runShortcode, Cpsi_Shortcodes->corvusPayCheckout, Cpsi_Shortcodes->_buildRedirectToPaymentGwForm, Cpsi_Shortcodes->_setOptionalFormFields, WC_Abstract_Legacy_Order->__get, wc_doing_it_wrong Pročitajte Debugging in WordPress za više informacija. (Ova poruka je dodana u inačici 3.0.) in public_html/wp-includes/functions.php on line 4147 [30-Apr-2018 08:16:58 UTC] PHP Notice: billing_postcode je neispravno pozvan. Order properties should not be accessed directly. Backtrace: require('wp-blog-header.php'), require_once('wp-includes/template-loader.php'), include('/themes/stockholm/page.php'), the_content, apply_filters('the_content'), WP_Hook->apply_filters, call_user_func_array, do_shortcode, preg_replace_callback, do_shortcode_tag, call_user_func, Cpsi_Init->executeShortcode, Cpsi_Shortcodes->runShortcode, Cpsi_Shortcodes->corvusPayCheckout, Cpsi_Shortcodes->_buildRedirectToPaymentGwForm, Cpsi_Shortcodes->_setOptionalFormFields, WC_Abstract_Legacy_Order->__get, wc_doing_it_wrong Pročitajte Debugging in WordPress za više informacija. (Ova poruka je dodana u inačici 3.0.) in public_html/wp-includes/functions.php on line 4147 [30-Apr-2018 08:17:35 UTC] PHP Notice: Trying to get property of non-object in public_html/wp-content/plugins/corvuspay-woocommerce-integration/classes.php on line 411 [30-Apr-2018 08:17:35 UTC] PHP Notice: WC_Order::get_order_currency je uklonjen od inačice 3.0! Umjesto toga, koristite WC_Order::get_currency. in public_html/wp-includes/functions.php on line 3839 ``` * [Emir Mulalić](https://wordpress.org/support/users/ckskusa/) * (@ckskusa) * [8 years, 1 month ago](https://wordpress.org/support/topic/warning-when-activating-this-plugin/#post-10253890) * +1 * I have the same problem. Plus, the payment side of the checkout window is stuck loading when plugin is activated. Viewing 4 replies - 1 through 4 (of 4 total) The topic ‘Warning when activating this plugin’ is closed to new replies. * ![](https://ps.w.org/corvuspay-woocommerce-integration/assets/icon.svg?rev=2999579) * [CorvusPay WooCommerce Payment Gateway](https://wordpress.org/plugins/corvuspay-woocommerce-integration/) * [Frequently Asked Questions](https://wordpress.org/plugins/corvuspay-woocommerce-integration/#faq) * [Support Threads](https://wordpress.org/support/plugin/corvuspay-woocommerce-integration/) * [Active Topics](https://wordpress.org/support/plugin/corvuspay-woocommerce-integration/active/) * [Unresolved Topics](https://wordpress.org/support/plugin/corvuspay-woocommerce-integration/unresolved/) * [Reviews](https://wordpress.org/support/plugin/corvuspay-woocommerce-integration/reviews/) * 4 replies * 3 participants * Last reply from: [Emir Mulalić](https://wordpress.org/support/users/ckskusa/) * Last activity: [8 years, 1 month ago](https://wordpress.org/support/topic/warning-when-activating-this-plugin/#post-10253890) * Status: not resolved