Error duplicating registration form

I have created a registration form which I want to duplicate, but when I do so I get these errors on the duplicated form:

Warning: Illegal string offset ‘title’ in /wp-content/plugins/easy-registration-forms/includes/class-form.php on line 99

Warning: Illegal string offset ‘id’ in /wp-content/plugins/easy-registration-forms/includes/class-form.php on line 100

Warning: Illegal string offset ‘fields’ in /wp-content/plugins/easy-registration-forms/includes/class-form.php on line 101

Warning: Illegal string offset ‘fields’ in /wp-content/plugins/easy-registration-forms/includes/class-form.php on line 101

Warning: Illegal string offset ‘fields’ in /wp-content/plugins/easy-registration-forms/includes/class-form.php on line 104

Warning: Invalid argument supplied for foreach() in /wp-content/plugins/easy-registration-forms/includes/class-form.php on line 104

Warning: Illegal string offset ‘type’ in /wp-content/plugins/easy-registration-forms/includes/class-form.php on line 135

Warning: Illegal string offset ‘type’ in /wp-content/plugins/easy-registration-forms/includes/class-form.php on line 139

Warning: Illegal string offset ‘default_role’ in /wp-content/plugins/easy-registration-forms/includes/class-form.php on line 139

Warning: Illegal string offset ‘auto_user_activation’ in /wp-content/plugins/easy-registration-forms/includes/class-form.php on line 139

Warning: Illegal string offset ‘access_roles’ in /wp-content/plugins/easy-registration-forms/includes/class-form.php on line 139

Warning: Illegal string offset ‘auto_reply’ in /wp-content/plugins/easy-registration-forms/includes/class-form.php on line 139

Warning: Illegal string offset ‘enable_external_url’ in /wp-content/plugins/easy-registration-forms/includes/class-form.php on line 139

Warning: Illegal string offset ‘external_url’ in /wp-content/plugins/easy-registration-forms/includes/class-form.php on line 139

Warning: Cannot assign an empty string to a string offset in /wp-content/plugins/easy-registration-forms/includes/class-form.php on line 139

Warning: Illegal string offset ‘enable_limit’ in /wp-content/plugins/easy-registration-forms/includes/class-form.php on line 139

Warning: Illegal string offset ‘auto_login’ in /wp-content/plugins/easy-registration-forms/includes/class-form.php on line 139

Warning: Illegal string offset ‘limit_by_date’ in /wp-content/plugins/easy-registration-forms/includes/class-form.php on line 139

Warning: Cannot assign an empty string to a string offset in /wp-content/plugins/easy-registration-forms/includes/class-form.php on line 139

Warning: Illegal string offset ‘limit_by_number’ in /wp-content/plugins/easy-registration-forms/includes/class-form.php on line 139

Warning: Illegal string offset ‘limit_type’ in /wp-content/plugins/easy-registration-forms/includes/class-form.php on line 139

Warning: Illegal string offset ‘enable_login_form’ in /wp-content/plugins/easy-registration-forms/includes/class-form.php on line 139

Warning: Illegal string offset ‘login_and_register’ in /wp-content/plugins/easy-registration-forms/includes/class-form.php on line 139

Warning: Illegal string offset ‘enabled_auto_reply’ in /wp-content/plugins/easy-registration-forms/includes/class-form.php on line 139

Warning: Illegal string offset ‘enable_admin_notification’ in /wp-content/plugins/easy-registration-forms/includes/class-form.php on line 139

Warning: Illegal string offset ‘admin_notification_msg’ in /wp-content/plugins/easy-registration-forms/includes/class-form.php on line 139

Warning: Illegal string offset ‘enable_act_notification’ in /wp-content/plugins/easy-registration-forms/includes/class-form.php on line 139

Warning: Illegal string offset ‘user_act_subject’ in /wp-content/plugins/easy-registration-forms/includes/class-form.php on line 139

Warning: Illegal string offset ‘user_act_msg’ in /wp-content/plugins/easy-registration-forms/includes/class-form.php on line 139

Warning: Illegal string offset ‘auto_reply_subject’ in /wp-content/plugins/easy-registration-forms/includes/class-form.php on line 139

Warning: Illegal string offset ‘admin_notification_from’ in /wp-content/plugins/easy-registration-forms/includes/class-form.php on line 139

Warning: Cannot assign an empty string to a string offset in /wp-content/plugins/easy-registration-forms/includes/class-form.php on line 139

Warning: Illegal string offset ‘admin_notification_from_name’ in /wp-content/plugins/easy-registration-forms/includes/class-form.php on line 139

Warning: Cannot assign an empty string to a string offset in /wp-content/plugins/easy-registration-forms/includes/class-form.php on line 139

Warning: Illegal string offset ‘unique_id_gen_method’ in /wp-content/plugins/easy-registration-forms/includes/class-form.php on line 139

Warning: Illegal string offset ‘unique_id_padding’ in /wp-content/plugins/easy-registration-forms/includes/class-form.php on line 139

Warning: Illegal string offset ‘unique_id_offset’ in /wp-content/plugins/easy-registration-forms/includes/class-form.php on line 139

Warning: Illegal string offset ‘unique_id_index’ in /wp-content/plugins/easy-registration-forms/includes/class-form.php on line 139

Warning: Illegal string offset ‘unique_id_prefix’ in /wp-content/plugins/easy-registration-forms/includes/class-form.php on line 139

Warning: Cannot assign an empty string to a string offset in /wp-content/plugins/easy-registration-forms/includes/class-form.php on line 139

Warning: Illegal string offset ‘recaptcha_enabled’ in /wp-content/plugins/easy-registration-forms/includes/class-form.php on line 139

Warning: Illegal string offset ‘enable_unique_id’ in /wp-content/plugins/easy-registration-forms/includes/class-form.php on line 139

Warning: Illegal string offset ‘redirect_to’ in /wp-content/plugins/easy-registration-forms/includes/class-form.php on line 139

Warning: Cannot assign an empty string to a string offset in /wp-content/plugins/easy-registration-forms/includes/class-form.php on line 139

Warning: Illegal string offset ‘label_position’ in /wp-content/plugins/easy-registration-forms/includes/class-form.php on line 139

Warning: Illegal string offset ‘layout’ in /wp-content/plugins/easy-registration-forms/includes/class-form.php on line 139

Warning: Illegal string offset ‘field_style’ in /wp-content/plugins/easy-registration-forms/includes/class-form.php on line 139

Warning: Illegal string offset ‘access_denied_msg’ in /wp-content/plugins/easy-registration-forms/includes/class-form.php on line 139

Warning: Illegal string offset ‘plan_enabled’ in /wp-content/plugins/easy-registration-forms/includes/class-form.php on line 139

Warning: Illegal string offset ‘limit_message’ in /wp-content/plugins/easy-registration-forms/includes/class-form.php on line 139

Warning: Illegal string offset ‘admin_notification_to’ in /wp-content/plugins/easy-registration-forms/includes/class-form.php on line 139

Warning: Cannot assign an empty string to a string offset in /wp-content/plugins/easy-registration-forms/includes/class-form.php on line 139

Warning: Illegal string offset ‘en_pwd_restriction’ in /wp-content/plugins/easy-registration-forms/includes/class-form.php on line 139

Warning: Illegal string offset ‘pwd_res_description’ in /wp-content/plugins/easy-registration-forms/includes/class-form.php on line 139

Warning: Illegal string offset ‘pwd_res_question’ in /wp-content/plugins/easy-registration-forms/includes/class-form.php on line 139

Warning: Illegal string offset ‘pwd_res_err’ in /wp-content/plugins/easy-registration-forms/includes/class-form.php on line 139

Warning: Illegal string offset ‘pwd_res_en_logged_in’ in /wp-content/plugins/easy-registration-forms/includes/class-form.php on line 139

Warning: Illegal string offset ‘pwd_res_answer’ in /wp-content/plugins/easy-registration-forms/includes/class-form.php on line 139

Warning: Cannot assign an empty string to a string offset in /wp-content/plugins/easy-registration-forms/includes/class-form.php on line 139

Warning: Illegal string offset ‘auto_reply_from’ in /wp-content/plugins/easy-registration-forms/includes/class-form.php on line 139

Warning: Cannot assign an empty string to a string offset in /wp-content/plugins/easy-registration-forms/includes/class-form.php on line 139

Warning: Illegal string offset ‘auto_reply_from_name’ in /wp-content/plugins/easy-registration-forms/includes/class-form.php on line 139

Warning: Cannot assign an empty string to a string offset in /wp-content/plugins/easy-registration-forms/includes/class-form.php on line 139

Warning: Illegal string offset ‘reports’ in /wp-content/plugins/easy-registration-forms/includes/class-form.php on line 139

Warning: Illegal string offset ‘auto_reply_msg’ in /wp-content/plugins/easy-registration-forms/includes/class-form.php on line 139

Warning: Illegal string offset ‘admin_notification_subject’ in /wp-content/plugins/easy-registration-forms/includes/class-form.php on line 139

Warning: Illegal string offset ‘before_form’ in /wp-content/plugins/easy-registration-forms/includes/class-form.php on line 139

Warning: Illegal string offset ‘success_msg’ in /wp-content/plugins/easy-registration-forms/includes/class-form.php on line 139

Warning: Illegal string offset ‘allow_only_registered’ in /wp-content/plugins/easy-registration-forms/includes/class-form.php on line 139

Warning: Illegal string offset ‘auto_reply_to’ in /wp-content/plugins/easy-registration-forms/includes/class-form.php on line 139

Warning: Cannot assign an empty string to a string offset in /wp-content/plugins/easy-registration-forms/includes/class-form.php on line 139

Warning: Illegal string offset ‘primary_field’ in /wp-content/plugins/easy-registration-forms/includes/class-form.php on line 139

Warning: Cannot assign an empty string to a string offset in /wp-content/plugins/easy-registration-forms/includes/class-form.php on line 139

Warning: Illegal string offset ‘primary_contact_name_field’ in /wp-content/plugins/easy-registration-forms/includes/class-form.php on line 139

Warning: Cannot assign an empty string to a string offset in /wp-content/plugins/easy-registration-forms/includes/class-form.php on line 139

Warning: Illegal string offset ‘allow_single_plan’ in /wp-content/plugins/easy-registration-forms/includes/class-form.php on line 139

Warning: Illegal string offset ‘payment_header’ in /wp-content/plugins/easy-registration-forms/includes/class-form.php on line 139

Warning: Illegal string offset ‘plans’ in /wp-content/plugins/easy-registration-forms/includes/class-form.php on line 139

Warning: Illegal string offset ‘enable_edit_notifications’ in /wp-content/plugins/easy-registration-forms/includes/class-form.php on line 139

Warning: Illegal string offset ‘edit_sub_user_email’ in /wp-content/plugins/easy-registration-forms/includes/class-form.php on line 139

Warning: Illegal string offset ‘edit_sub_user_from’ in /wp-content/plugins/easy-registration-forms/includes/class-form.php on line 139

Warning: Cannot assign an empty string to a string offset in /wp-content/plugins/easy-registration-forms/includes/class-form.php on line 139

Warning: Illegal string offset ‘edit_sub_user_from_name’ in /wp-content/plugins/easy-registration-forms/includes/class-form.php on line 139

Warning: Cannot assign an empty string to a string offset in /wp-content/plugins/easy-registration-forms/includes/class-form.php on line 139

Warning: Illegal string offset ‘edit_sub_user_subject’ in /wp-content/plugins/easy-registration-forms/includes/class-form.php on line 139

Warning: Illegal string offset ‘edit_sub_admin_email’ in /wp-content/plugins/easy-registration-forms/includes/class-form.php on line 139

Warning: Illegal string offset ‘edit_sub_admin_from’ in /wp-content/plugins/easy-registration-forms/includes/class-form.php on line 139

Warning: Cannot assign an empty string to a string offset in /wp-content/plugins/easy-registration-forms/includes/class-form.php on line 139

Warning: Illegal string offset ‘edit_sub_admin_from_name’ in /wp-content/plugins/easy-registration-forms/includes/class-form.php on line 139

Warning: Cannot assign an empty string to a string offset in /wp-content/plugins/easy-registration-forms/includes/class-form.php on line 139

Warning: Illegal string offset ‘edit_sub_admin_subject’ in /wp-content/plugins/easy-registration-forms/includes/class-form.php on line 139

Warning: Illegal string offset ‘edit_sub_admin_list’ in /wp-content/plugins/easy-registration-forms/includes/class-form.php on line 139

Warning: Cannot assign an empty string to a string offset in /wp-content/plugins/easy-registration-forms/includes/class-form.php on line 139

Warning: Illegal string offset ‘enable_delete_notifications’ in /wp-content/plugins/easy-registration-forms/includes/class-form.php on line 139

Warning: Illegal string offset ‘delete_sub_user_email’ in /wp-content/plugins/easy-registration-forms/includes/class-form.php on line 139

Warning: Illegal string offset ‘delete_sub_user_from’ in /wp-content/plugins/easy-registration-forms/includes/class-form.php on line 139

Warning: Cannot assign an empty string to a string offset in /wp-content/plugins/easy-registration-forms/includes/class-form.php on line 139

Warning: Illegal string offset ‘delete_sub_user_from_name’ in /wp-content/plugins/easy-registration-forms/includes/class-form.php on line 139

Warning: Cannot assign an empty string to a string offset in /wp-content/plugins/easy-registration-forms/includes/class-form.php on line 139

Warning: Illegal string offset ‘delete_sub_user_subject’ in /wp-content/plugins/easy-registration-forms/includes/class-form.php on line 139

Warning: Illegal string offset ‘delete_sub_admin_email’ in /wp-content/plugins/easy-registration-forms/includes/class-form.php on line 139

Warning: Illegal string offset ‘delete_sub_admin_from’ in /wp-content/plugins/easy-registration-forms/includes/class-form.php on line 139

Warning: Cannot assign an empty string to a string offset in /wp-content/plugins/easy-registration-forms/includes/class-form.php on line 139

Warning: Illegal string offset ‘delete_sub_admin_from_name’ in /wp-content/plugins/easy-registration-forms/includes/class-form.php on line 139

Warning: Cannot assign an empty string to a string offset in /wp-content/plugins/easy-registration-forms/includes/class-form.php on line 139

Warning: Illegal string offset ‘delete_sub_admin_subject’ in /wp-content/plugins/easy-registration-forms/includes/class-form.php on line 139

Warning: Illegal string offset ‘delete_sub_admin_list’ in /wp-content/plugins/easy-registration-forms/includes/class-form.php on line 139

Warning: Cannot assign an empty string to a string offset in /wp-content/plugins/easy-registration-forms/includes/class-form.php on line 139

Warning: Illegal string offset ‘form_admin_list’ in /wp-content/plugins/easy-registration-forms/includes/class-form.php on line 139

Warning: Cannot assign an empty string to a string offset in /wp-content/plugins/easy-registration-forms/includes/class-form.php on line 139

Warning: Illegal string offset ‘en_edit_sub’ in /wp-content/plugins/easy-registration-forms/includes/class-form.php on line 139

Warning: Illegal string offset ‘allow_sub_deletion’ in /wp-content/plugins/easy-registration-forms/includes/class-form.php on line 139

Warning: Illegal string offset ‘edit_fields’ in /wp-content/plugins/easy-registration-forms/includes/class-form.php on line 139

Warning: Illegal string offset ‘opt_in’ in /wp-content/plugins/easy-registration-forms/includes/class-form.php on line 139

Warning: Illegal string offset ‘opt_text’ in /wp-content/plugins/easy-registration-forms/includes/class-form.php on line 139

Warning: Illegal string offset ‘opt_default_state’ in /wp-content/plugins/easy-registration-forms/includes/class-form.php on line 139

Warning: Illegal string offset ‘limit_time’ in /wp-content/plugins/easy-registration-forms/includes/class-form.php on line 139

Warning: Cannot assign an empty string to a string offset in /wp-content/plugins/easy-registration-forms/includes/class-form.php on line 139

Warning: Illegal string offset ‘sub_columns’ in /wp-content/plugins/easy-registration-forms/includes/class-form.php on line 139

Warning: Illegal string offset ‘dis_mul_sub’ in /wp-content/plugins/easy-registration-forms/includes/class-form.php on line 139

Warning: Illegal string offset ‘mul_sub_denial_msg’ in /wp-content/plugins/easy-registration-forms/includes/class-form.php on line 139

Warning: Illegal string offset ‘type’ in /wp-content/plugins/easy-registration-forms/includes/admin/overview/class-form-cards.php on line 165

Warning: Illegal string offset ‘id’ in /wp-content/plugins/easy-registration-forms/includes/admin/overview/class-form-cards.php on line 175

Warning: Illegal string offset ‘id’ in /wp-content/plugins/easy-registration-forms/includes/admin/overview/class-form-cards.php on line 176