annot redeclare field_form_field_config_edit_form_entity_builder()

Fatal error: Cannot redeclare field_form_field_config_edit_form_entity_builder() (previously declared in /var/www/html/docroot/core/modules/field/field.module:470) in /var/www/html/docroot/core/modules/field/field.module on line 518

Are patches installed?

Could you please provide more details and exact steps to reproduce the error?

There is only one declaration of field_form_field_config_edit_form_entity_builder() in field.module in all current versions of Drupal core, but your error message implies there are two copies - have you patched or manually modified core in some way?

I encountered issues when I updated the Drupal core from version 10.1.8 to 10.2.6.