Multiple undefined variable

Problem/Motivation

Multiple undefined variable

Undefined variable $h2_attr_responsive in Drupal\entity_bs_accordion_tab_formatter\Plugin\Field\FieldFormatter\EntityBSAccordionTabFormatter->viewElements()

Undefined variable $button_attr_responsive in Drupal\entity_bs_accordion_tab_formatter\Plugin\Field\FieldFormatter\EntityBSAccordionTabFormatter->viewElements()

Undefined variable $body_attributes_responsive in Drupal\entity_bs_accordion_tab_formatter\Plugin\Field\FieldFormatter\EntityBSAccordionTabFormatter->viewElements()