Can't access widget function inside the WP admin area so I can't change my header & footer. Every time I try to access it, I get a fatal error message. I can access the rest of the site in the Admin panel.

WP also sent me an error message with the code issue:
Error Details

=============

An error of type E_ERROR was caused in line 57 of the file /home/ge1sau1susy5/FAR/wp-content/plugins/flynext-core/wp-widgets/theme-about-me-widget.php. Error message: Uncaught Error: Call to undefined function tutor_utils() in /home/ge1sau1susy5/FAR/wp-content/plugins/flynext-core/wp-widgets/theme-about-me-widget.php:57

Stack trace:

#0 /home/ge1sau1susy5/FAR/wp-content/plugins/flynext-core/lib/codestar-framework/classes/widget-options.class.php(62): flynext_about_me_widget(Array, Array)

#1 /home/ge1sau1susy5/FAR/wp-includes/class-wp-widget.php(393): CSF_Widget->widget(Array, Array)

#2 /home/ge1sau1susy5/FAR/wp-includes/widgets.php(2022): WP_Widget->display_callback(Array, Array)

#3 /home/ge1sau1susy5/FAR/wp-includes/rest-api/endpoints/class-wp-rest-widgets-controller.php(697): wp_render_widget('flynext_about_m...', 'tutor-sidebar')

#4 /home/ge1sau1susy5/FAR/wp-includes/rest-api/endpoints/class-wp-rest-widgets-controller.php(154): WP_REST_Widgets_Controller->prepare_item_for_response(Array, Object(WP_REST_Request))

#5 /home/ge1sau1susy5/FAR/wp-includes/rest-api/class-wp-rest-server.php(1143): WP_REST_Widgets_Controller->get_items(Object(WP_REST_Request))

#6 /home/ge1sau1sus

Currently running:

WordPress version 6.0.1

Active theme: Flynext Child (version 1.0.0)

Current plugin: Flynext Core (version 2.1.2)

PHP version 7.4.30

Actually, I solved it. Apparently, the ENTIRE package and all plugins have to be installed. I wanted to leave out the LMS since we're not going to use it. But after I installed and activated it, the widget issue disappeared.