From the error message, below, it appears that there is a conflict between you plug-in and wp-forms.
Fatal error: Cannot redeclare br2nl() (previously declared in /public_html/wp-content/plugins/events-manager-extended/events-manager.php:951) in /public_html/wp-content/plugins/wordpress-forms/libraries/build.helper.php on line 313
I’m not much of a programmer, but it appears that both of you are using the same name for a function within the functions.php file.
I’m also sending the developer over at WP Forms the same message.
I hope that something can get worked out as I like both plug-ins and they serve completely different purpose.
Regards,
John Newton