Error: Call to undefined method Ai1wm_Database_Mysqli::set_oxygen_builder

Hi,

This error gets added to the error log several times when I import a wpress-file.
What does this mean? And how can I fix it, please?

Thanks.

{"type":1,"message":"Uncaught Error: Call to undefined method Ai1wm_Database_Mysqli::set_oxygen_builder() in C:\\wamp64\\www\\demosites\\wp-content\\plugins\\all-in-one-wp-migration-multisite-extension\\lib\\model\\import\\class-ai1wmme-import-database.php:978\nStack trace:\n#0 C:\\wamp64\\www\\demosites\\wp-content\\plugins\\all-in-one-wp-migration\\lib\\controller\\class-ai1wm-import-controller.php(70): Ai1wmme_Import_Database::execute(Array)\n#1 C:\\wamp64\\www\\demosites\\wp-includes\\class-wp-hook.php(287): Ai1wm_Import_Controller::import(Array)\n#2 C:\\wamp64\\www\\demosites\\wp-includes\\class-wp-hook.php(311): WP_Hook->apply_filters('', Array)\n#3 C:\\wamp64\\www\\demosites\\wp-includes\\plugin.php(484): WP_Hook->do_action(Array)\n#4 C:\\wamp64\\www\\demosites\\wp-admin\\admin-ajax.php(184): do_action('wp_ajax_ai1wm_i...')\n#5 {main}\n thrown","file":"C:\\wamp64\\www\\demosites\\wp-content\\plugins\\all-in-one-wp-migration-multisite-extension\\lib\\model\\import\\class-ai1wmme-import-database.php","line":978}