There is no extractor with alias "alias_of_the_extractor". Available extractors: # none #

[fraballi]

Q	A
Bundle version	dev-master
Symfony version	3.2.4
PHP version	7.1.1

Expected behavior

unknown extractor class clarified

Actual behavior

NOt working /_trans uri

Steps to reproduce

There are no translation files for this config, please run the translation:extract command first.
500 Internal Server Error - RuntimeException

[maryamezzaty24]

hi comment this sentence "extractors: [alias_of_the_extractor]" in config.yml

like this:
jms_translation:
locales: ['en', 'fa']
source_language: 'en'
configs:
app:
dirs: ["%kernel.root_dir%", "%kernel.root_dir%/../src"]
output_dir: "%kernel.root_dir%/Resources/translations"
domains: ["messages"]
ignored_domains: [routes]
excluded_names: ["*TestCase.php", "*Test.php"]
excluded_dirs: [cache, data, logs]

extractors: [alias_of_the_extractor