If you are using Behat for testing your PHP application and you encounter the following error after trying to run your tests: In UninitializedContextEnvironment.php line 44: Tests\\Feature\\Behat\\Context\\Account\\MyOldContext\\ context class not found and can not be used. Do not forget to remove your obsolete Behat Context file (MyOldContext in this case) from your behat.yml configuration file: default: suites: default: paths: - '%paths.base%/tests/Feature/Behat/features' contexts: - Tests\\Feature\\Behat\\Context\\ApplicationContext # Remove the old context file - Tests\\Feature\\Behat\\Context\\MyOldContext - Tests\\Feature\\Behat\\Context\\EmailContext - Behat\\MinkExtension\\Context\\MinkContext - behatch:context:browser - behatch:context:debug - behatch:context:system - behatch:context:json - behatch:context:rest