13 files declare their use of Error
- bootstrap.inc in core/includes/ bootstrap.inc 
- Functions that need to be loaded on every Drupal request.
- BrowserHtmlDebugTrait.php in core/tests/ Drupal/ Tests/ BrowserHtmlDebugTrait.php 
- BrowserTestBase.php in core/tests/ Drupal/ Tests/ BrowserTestBase.php 
- ConfigEntityUpdater.php in core/lib/ Drupal/ Core/ Config/ Entity/ ConfigEntityUpdater.php 
- DefaultExceptionHtmlSubscriber.php in core/lib/ Drupal/ Core/ EventSubscriber/ DefaultExceptionHtmlSubscriber.php 
- errors.inc in core/includes/ errors.inc 
- Functions for error handling.
- ErrorTest.php in core/tests/ Drupal/ Tests/ Core/ Utility/ ErrorTest.php 
- ExceptionLoggingSubscriber.php in core/lib/ Drupal/ Core/ EventSubscriber/ ExceptionLoggingSubscriber.php 
- FinalExceptionSubscriber.php in core/lib/ Drupal/ Core/ EventSubscriber/ FinalExceptionSubscriber.php 
- MigrateExecutable.php in core/modules/ migrate/ src/ MigrateExecutable.php 
- SessionHandler.php in core/lib/ Drupal/ Core/ Session/ SessionHandler.php 
- TestHttpClientMiddleware.php in core/lib/ Drupal/ Core/ Test/ HttpClientMiddleware/ TestHttpClientMiddleware.php 
- update.inc in core/includes/ update.inc 
- Drupal database update API.
Buggy or inaccurate documentation? Please file an issue. Need support? Need help programming? Connect with the Drupal community.
