E_ERROR in my-calendar-categories.php

An error of type E_ERROR was caused in line 51 of the file …/plugins/my-calendar/my-calendar-categories.php
Error message: Uncaught Error: Call to undefined function mime_content_type() in /plugins/my-calendar/my-calendar-categories.php:51
Stack trace:
#0 …/plugins/my-calendar/my-calendar-help.php(335): mc_directory_list(‘…’)
#1 …/plugins/my-calendar/my-calendar-categories.php(590): mc_display_icons()
#2 …/plugins/my-calendar/my-calendar-categories.php(231): mc_edit_category_form(‘add’)
#3 [internal function]: my_calendar_manage_categories(”)
#4 …/wp-includes/class-wp-hook.php(307): call_user_func_array(‘my_calendar_man…’, Array)
#5 …/wp-includes/class-wp-hook.php(331): WP_Hook->apply_filters(”, Array)
#6 …/wp-includes/plugin.php(476): WP_Hook->do_action(Array)
#
WordPress version 6.0.2
Active theme: Neve (version 3.4.2)
Current plugin: My Calendar (version 3.3.23)
PHP version 7.4.30