It appears to be a conflict with Toolset Views and Elementor, too?
Error Details
=============
An error of type E_ERROR was caused in line 376 of the file /home/xxxx/public_html/wp-content/plugins/cred-frontend-editor/vendor/toolset/toolset-common/inc/autoloaded/interop/handler/elementor/widgets/view/view.php. Error message: Uncaught Error: Call to undefined method Elementor\Utils::is_ajax() in /home/xxxx/public_html/wp-content/plugins/cred-frontend-editor/vendor/toolset/toolset-common/inc/autoloaded/interop/handler/elementor/widgets/view/view.php:376
Stack trace:
#0 /home/xxxx/public_html/wp-includes/class-wp-hook.php(303): OTGS\Toolset\Common\Interop\Handler\Elementor\ViewWidget->maybe_use_view_elementor_widget_instead('')
#1 /home/xxxx/public_html/wp-includes/class-wp-hook.php(327): WP_Hook->apply_filters('', Array)
#2 /home/xxxx/public_html/wp-includes/plugin.php(470): WP_Hook->do_action(Array)
#3 /home/xxxx/public_html/wp-content/plugins/wp-views/embedded/inc/wpv-widgets.php(81): do_action('wpv_action_befo...')
#4 /home/xxxx/public_html/wp-includes/class-wp-widget.php(534): WPV_Widget->form(Array)
#5 /home/xxxx/public_html/wp-admin/includes/widgets.php(274): WP_Widget->form_callback(Array)
#6 /home/xxxx/public_html/wp-admin/includes/widgets.php(60): wp_widget_control(Array, Array)
#7 /home/xxxx/public_html/wp-admin/
I can update custom sidebars by disabling the Toolset Views plugin temporarily, but I’m wondering; do I have to now contact every plugin developer associated with this to get a fix? Thanks in advance.