What could be the error in parameters.yml?

Question

symfony

InvalidArgumentException in YamlFileLoader.php line 338:
There is no extension able to load the configuration for "parameters" (in ~/app/config/parameters.yml).
What could be wrong and why you don't like parameters:

parameters:
    database_driver: pdo_mysql
    database_host: localhost
    database_port: null
    database_name: new_colornew_prod
    database_user: colornew_prod
    database_password: 7Q4f2V8e
    # mailer_transport: smtp
    # mailer_host: 127.0.0.1
    # mailer_user: null
    # mailer_password: null
    mailer_transport: gmail

The config itself is valid in terms of yaml syntax

Answer 1

The problem was that after editing the file through ISPManager, something happened to the file name itself .. or properties. Recreating the parameters.yml file helped.

Answer 2

Try to demolish the vendor folder and run composer install
I didn’t encounter such an error, but it seems that which packages were not delivered (for an unknown reason)