The very nice WordPress plugin Advanced Custom Fields (ACF) was recently updated to version 5.7.10 and with that update some internal functions was removed. Unfortunately Simple History used one of these functions. Version 2.29.2 of Simple History is a small update that fixes the problem that some users had after the ACF update.
As alway, if you like Simple History please consider giving it a nice review as a thank!
Changelog for version 2.29.2 (JANUARY 2019):
- Fix for (the still great) plugin Advanced Custom Fields 5.7.10 that removed the function _acf_get_field_by_id that this plugin used. Fixes https://wordpress.org/support/topic/uncaught-error-call-to-undefined-function-_acf_get_field_by_id/.