Failed Import (Fatal Errors)

Warning: Undefined variable $ACUIHelper in /wp-content/plugins/import-users-from-csv-with-meta/classes/import.php on line 444

Fatal error: Uncaught Error: Value of type null is not callable in /wp-content/plugins/import-users-from-csv-with-meta/classes/import.php:444 Stack trace: #0 /wp-content/plugins/import-users-from-csv-with-meta/classes/import.php(237): ACUI_Import->import_users() #1 /wp-content/plugins/import-users-from-csv-with-meta/classes/import.php(26): ACUI_Import->fileupload_process() #2 /wp-includes/class-wp-hook.php(324): ACUI_Import->show() #3 /wp-includes/class-wp-hook.php(348): WP_Hook->apply_filters() #4 /wp-includes/plugin.php(517): WP_Hook->do_action() #5 /wp-admin/admin.php(259): do_action() #6 /wp-admin/tools.php(40): require_once('...') #7 {main} thrown in /wp-content/plugins/import-users-from-csv-with-meta/classes/import.php on line 444

Deprecated: preg_replace(): Passing null to parameter #3 ($subject) of type array|string is deprecated in /wp-includes/PHPMailer/PHPMailer.php on line 1308
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File must contain at least 2 columns: username and email. These should be the first two columns and it should be placed in this order: username and email. Both data are required unless you use this addon to allow empty emails. If there are more columns, this plugin will manage it automatically.

Fatal error: sprintf(): Passing null to parameter #1 ($format) of type string is deprecated in /wp-content/plugins/import-users-from-csv-with-meta/classes/homepage.php on line 49