1.34.1 Error

Updated to 1.34.1 and getting errors: here is the report and we downgraded to 1.33 that fixed it.

Error Details
=============
An error of type E_ERROR was caused in line 7877 of the file
/var/www/americanoffroads.com/htdocs/wp-content/plugins/schema-and-structured-data-for-wp/output/class-saswp-output-service.php.
Error message: Uncaught Error: Call to undefined method
WC_DateTime::gmdate() in
/var/www/americanoffroads.com/htdocs/wp-content/plugins/schema-and-structured-data-for-wp/output/class-saswp-output-service.php:7877
Stack trace:
#0 /var/www/americanoffroads.com/htdocs/wp-content/plugins/schema-and-structured-data-for-wp/core/array-list/schema-properties.php(6021):
SASWP_Output_Service->saswp_woocommerce_product_details()
#1 /var/www/americanoffroads.com/htdocs/wp-content/plugins/schema-and-structured-data-for-wp/view/class-saswp-post-specific.php(482):
saswp_get_fields_by_schema_type()
#2 /var/www/americanoffroads.com/htdocs/wp-content/plugins/schema-and-structured-data-for-wp/view/class-saswp-post-specific.php(648):
SASWP_Post_Specific->saswp_post_meta_box_fields()
#3 /var/www/americanoffroads.com/htdocs/wp-admin/includes/template.php(1456):
SASWP_Post_Specific->saswp_post_meta_box_callback()
#4 /var/www/americanoffroads.com/htdocs/wp-admin/edit-form-advanced.php(746):
do_meta_boxes()
#5 /var/www/americanoffroads.com/htdocs/wp-admin/post.php(206): require(‘…’)
#6 {main}
? thrown