19 uses of REQUIREMENT_ERROR

aggregator_requirements in drupal/core/modules/aggregator/aggregator.install
Implements hook_requirements().
color_requirements in drupal/core/modules/color/color.install
Implements hook_requirements().
drupal_check_module in drupal/core/includes/install.inc
Checks a module's requirements.
drupal_verify_profile in drupal/core/includes/install.inc
Verifies that all dependencies are met for a given installation profile.
hook_requirements in drupal/core/modules/system/system.api.php
Check installation requirements and do status reporting.
image_requirements in drupal/core/modules/image/image.install
Implements hook_requirements() to check the PHP GD Library.
install_check_requirements in drupal/core/includes/install.core.inc
Checks installation requirements and reports any errors.
install_check_translations in drupal/core/includes/install.core.inc
Checks installation requirements and reports any errors.
install_display_requirements in drupal/core/includes/install.core.inc
Displays installation requirements.
requirements1_test_requirements in drupal/core/modules/system/tests/modules/requirements1_test/requirements1_test.install
Implements hook_requirements().
simpletest_requirements in drupal/core/modules/simpletest/simpletest.install
Implements hook_requirements().
system_requirements in drupal/core/modules/system/system.install
Test and report Drupal installation requirements.
unicode_requirements in drupal/core/includes/unicode.inc
Returns Unicode library status and errors.
update_check_requirements in drupal/core/update.php
Checks update requirements and reports errors and (optionally) warnings.
update_page_build in drupal/core/modules/update/update.module
Implements hook_page_build().
update_prepare_d8_bootstrap in drupal/core/includes/update.inc
Performs extra steps required to bootstrap when using a Drupal 7 database.
update_script_test_requirements in drupal/core/modules/system/tests/modules/update_script_test/update_script_test.install
Implements hook_requirements().
_update_cron_notify in drupal/core/modules/update/update.fetch.inc
Performs any notifications that should be done once cron fetches new data.
_update_requirement_check in drupal/core/modules/update/update.install
Fills in the requirements array.