In Post Ads not working and getting PHP warnings

I can't get 'custom ads' to insert into existing posts - and getting a bunch of PHP errors

PHP Error Count Location Call Stack Component
Warning Illegal string offset 'enabled' 1 wp-content/plugins/custom-ads/lib/class_wdca_admin_form_renderer.php:20 Wdca_AdminFormRenderer->_create_checkbox()
wp-content/plugins/custom-ads/lib/class_wdca_admin_form_renderer.php:54
Wdca_AdminFormRenderer->create_enabled_box()
Unknown location
do_settings_fields()
wp-admin/includes/template.php:1299
do_settings_sections()
wp-content/plugins/custom-ads/lib/forms/plugin_settings.php:7
Wdca_AdminPages->create_admin_page()
Unknown location
do_action('wdca_custom_ad_page_wdca')
wp-admin/admin.php:222 Plugin: custom-ads
Illegal string offset 'live_mode' 1 wp-content/plugins/custom-ads/lib/class_wdca_admin_form_renderer.php:20 Wdca_AdminFormRenderer->_create_checkbox()
wp-content/plugins/custom-ads/lib/class_wdca_admin_form_renderer.php:58
Wdca_AdminFormRenderer->create_live_mode_box()
Unknown location
do_settings_fields()
wp-admin/includes/template.php:1299
do_settings_sections()
wp-content/plugins/custom-ads/lib/forms/plugin_settings.php:7
Wdca_AdminPages->create_admin_page()
Unknown location
do_action('wdca_custom_ad_page_wdca')
wp-admin/admin.php:222 Plugin: custom-ads
Illegal string offset 'predefined_before_first_p' 1 wp-content/plugins/custom-ads/lib/class_wdca_admin_form_renderer.php:20 Wdca_AdminFormRenderer->_create_checkbox()
wp-content/plugins/custom-ads/lib/class_wdca_admin_form_renderer.php:129
Wdca_AdminFormRenderer->create_predefined_positions_box()
Unknown location
do_settings_fields()
wp-admin/includes/template.php:1299
do_settings_sections()
wp-content/plugins/custom-ads/lib/forms/plugin_settings.php:7
Wdca_AdminPages->create_admin_page()
Unknown location
do_action('wdca_custom_ad_page_wdca')
wp-admin/admin.php:222 Plugin: custom-ads
Illegal string offset 'predefined_halfway_through' 1 wp-content/plugins/custom-ads/lib/class_wdca_admin_form_renderer.php:20 Wdca_AdminFormRenderer->_create_checkbox()
wp-content/plugins/custom-ads/lib/class_wdca_admin_form_renderer.php:135
Wdca_AdminFormRenderer->create_predefined_positions_box()
Unknown location
do_settings_fields()
wp-admin/includes/template.php:1299
do_settings_sections()
wp-content/plugins/custom-ads/lib/forms/plugin_settings.php:7
Wdca_AdminPages->create_admin_page()
Unknown location
do_action('wdca_custom_ad_page_wdca')
wp-admin/admin.php:222 Plugin: custom-ads
Illegal string offset 'predefined_after_last_p' 1 wp-content/plugins/custom-ads/lib/class_wdca_admin_form_renderer.php:20 Wdca_AdminFormRenderer->_create_checkbox()
wp-content/plugins/custom-ads/lib/class_wdca_admin_form_renderer.php:141
Wdca_AdminFormRenderer->create_predefined_positions_box()
Unknown location
do_settings_fields()
wp-admin/includes/template.php:1299
do_settings_sections()
wp-content/plugins/custom-ads/lib/forms/plugin_settings.php:7
Wdca_AdminPages->create_admin_page()
Unknown location
do_action('wdca_custom_ad_page_wdca')
wp-admin/admin.php:222 Plugin: custom-ads
Illegal string offset 'predefined_ignore_other' 1 wp-content/plugins/custom-ads/lib/class_wdca_admin_form_renderer.php:20 Wdca_AdminFormRenderer->_create_checkbox()
wp-content/plugins/custom-ads/lib/class_wdca_admin_form_renderer.php:150
Wdca_AdminFormRenderer->create_predefined_positions_box()
Unknown location
do_settings_fields()
wp-admin/includes/template.php:1299
do_settings_sections()
wp-content/plugins/custom-ads/lib/forms/plugin_settings.php:7
Wdca_AdminPages->create_admin_page()
Unknown location
do_action('wdca_custom_ad_page_wdca')
wp-admin/admin.php:222 Plugin: custom-ads
Illegal string offset 'ga_integration' 1 wp-content/plugins/custom-ads/lib/class_wdca_admin_form_renderer.php:20 Wdca_AdminFormRenderer->_create_checkbox()
wp-content/plugins/custom-ads/lib/class_wdca_admin_form_renderer.php:203
Wdca_AdminFormRenderer->create_ga_integration_box()
Unknown location
do_settings_fields()
wp-admin/includes/template.php:1299
do_settings_sections()
wp-content/plugins/custom-ads/lib/forms/plugin_settings.php:7
Wdca_AdminPages->create_admin_page()
Unknown location
do_action('wdca_custom_ad_page_wdca')
wp-admin/admin.php:222 Plugin: custom-ads
Illegal string offset 'cpt_skip_posts' 1 wp-content/plugins/custom-ads/lib/class_wdca_admin_form_renderer.php:20 Wdca_AdminFormRenderer->_create_checkbox()
wp-content/plugins/custom-ads/lib/class_wdca_admin_form_renderer.php:253
Wdca_AdminFormRenderer->create_cpt_ads_box()
Unknown location
do_settings_fields()
wp-admin/includes/template.php:1299
do_settings_sections()
wp-content/plugins/custom-ads/lib/forms/plugin_settings.php:7
Wdca_AdminPages->create_admin_page()
Unknown location
do_action('wdca_custom_ad_page_wdca')
wp-admin/admin.php:222 Plugin: custom-ads
Illegal string offset 'post_metabox' 1 wp-content/plugins/custom-ads/lib/class_wdca_admin_form_renderer.php:20 Wdca_AdminFormRenderer->_create_checkbox()
wp-content/plugins/custom-ads/lib/class_wdca_admin_form_renderer.php:260
Wdca_AdminFormRenderer->create_post_metabox_box()
Unknown location
do_settings_fields()
wp-admin/includes/template.php:1299
do_settings_sections()
wp-content/plugins/custom-ads/lib/forms/plugin_settings.php:7
Wdca_AdminPages->create_admin_page()
Unknown location
do_action('wdca_custom_ad_page_wdca')
wp-admin/admin.php:222 Plugin: custom-ads
Illegal string offset 'enable_late_binding' 1 wp-content/plugins/custom-ads/lib/class_wdca_admin_form_renderer.php:20 Wdca_AdminFormRenderer->_create_checkbox()
wp-content/plugins/custom-ads/lib/class_wdca_admin_form_renderer.php:371
Wdca_AdminFormRenderer->create_lazy_loading_box()
Unknown location
do_settings_fields()
wp-admin/includes/template.php:1299
do_settings_sections()
wp-content/plugins/custom-ads/lib/forms/plugin_settings.php:7
Wdca_AdminPages->create_admin_page()
Unknown location
do_action('wdca_custom_ad_page_wdca')
wp-admin/admin.php:222 Plugin: custom-ads
Notice Undefined index: custom_post_types 1 wp-content/plugins/custom-ads/lib/class_wdca_admin_form_renderer.php:14 Wdca_AdminFormRenderer->_get_option()
wp-content/plugins/custom-ads/lib/class_wdca_admin_form_renderer.php:240
Wdca_AdminFormRenderer->create_cpt_ads_box()
Unknown location
do_settings_fields()
wp-admin/includes/template.php:1299
do_settings_sections()
wp-content/plugins/custom-ads/lib/forms/plugin_settings.php:7
Wdca_AdminPages->create_admin_page()
Unknown location
do_action('wdca_custom_ad_page_wdca')
wp-admin/admin.php:222 Plugin: custom-ads
Undefined index: tag_ads 1 wp-content/plugins/custom-ads/lib/class_wdca_admin_form_renderer.php:14 Wdca_AdminFormRenderer->_get_option()
wp-content/plugins/custom-ads/lib/class_wdca_admin_form_renderer.php:320
Wdca_AdminFormRenderer->create_tags_box()
Unknown location
do_settings_fields()
wp-admin/includes/template.php:1299
do_settings_sections()
wp-content/plugins/custom-ads/lib/forms/plugin_settings.php:7
Wdca_AdminPages->create_admin_page()
Unknown location
do_action('wdca_custom_ad_page_wdca')
wp-admin/admin.php:222 Plugin: custom-ads
Strict Redefining already defined constructor for class Wdca_AdminPages 1 wp-content/plugins/custom-ads/lib/class_wdca_admin_pages.php:9 wdca__init()
wp-content/plugins/custom-ads/custom-ads.php:75
wdca__init()
Unknown location
do_action('init')
wp-settings.php:411 Plugin: custom-ads
Non-static method Wdca_AdminPages::serve() should not be called statically 1 wp-content/plugins/custom-ads/custom-ads.php:76 Wdca_AdminPages::serve()
wp-content/plugins/custom-ads/custom-ads.php:76
wdca__init()
Unknown location
do_action('init')
wp-settings.php:411 Plugin: custom-ads