Fatal error

Hi! When using the plugin I get this at the bottom of all the admin pages of the plugin:

Fatal error: Uncaught Error: Class “CIPFA\base\CIPFA_RatePlugin” not found

in mysite/wp-content/plugins/csv-importer-plus-for-acf/templates/upload-form.php:113 Stack trace: #0 /var/www/mysite/wp-content/plugins/csv-importer-plus-for-acf/includes/api/callbacks/CIPFA_PagesCallBacks.php(45): require_once() #1 /var/mysite/wp-includes/class-wp-hook.php(324): CIPFA\api\callbacks\CIPFA_PagesCallBacks->cipfa_csvAcfImporterForm(”) #2 /var/mysite/wp-includes/class-wp-hook.php(348): WP_Hook->apply_filters(”, Array) #3 /var/mysite/wp-includes/plugin.php(517): WP_Hook->do_action(Array) #4 /var/www/mysite/wp-admin/admin.php(260): do_action(‘toplevel_page_c…’) #5 {main} thrown in /var/www/mysite/wp-content/plugins/csv-importer-plus-for-acf/templates/upload-form.php on line 113