Entities outside of the standard node and media may have file fields that do not have the getThirdPartySettings() function. In those cases, PDF Preview Images's entity_presave hook prevents the entity from saving with the following error:
Error: Call to undefined method Drupal\Core\Field\BaseFieldDefinition::getThirdPartySetting() in pdf_preview_image_entity_presave()
Install a module like section_library which defines an entity with a file field that does not use that method and attempt to save an entity.
Adding a check to make sure that the field definition has the getThirdPartySettings() function before calling it resolves this problem.
abhishek_gupta1 → made their first commit to this issue’s fork.
@jastraat, applied above patch and issue has fixed, also created MR , moving RTBC++