trackback_upgrade.php

Hello,

I do not manage to use trackback module and upgrade previous version from 4.6 to 4.7.
I got the following message:
Fatal error: Call to undefined function form_submit() in /var/www/blog/trackback_upgrade.php on line 142

I tried formupdater, but I have not been able to solve it? Does anyone have any idea how could I solve this?

Thanks!