Call to a member function get_validators() on a non-object about wp-forms HOT 2 CLOSED

You're setting up your validator callback correctly. The form itself is not getting passed into the Submission object. How are you hooking in your registration callback (i.e., where are you calling wp_register_form())? Are you hooked into 'wp_forms_register'? My initial suspicion is that you're registering the form too late.

from wp-forms.

I was calling the wp_register_form() method, but i hadn't realised that i also needed to hook into the 'wp_register_form' action. Might be good to add more emphasis to these two steps in the documentation.

from wp-forms.