composer require admin -> Nothing to install, update or remove

  admin, composer-php, package, symfony, terminal

I’m trying to install easy_admin in my project, but when i try to run the command "composer require admin" in the folder project, the follow will display and nothing is installed:

Using version ^3.1 for easycorp/easyadmin-bundle
./composer.json has been updated
Running composer update easycorp/easyadmin-bundle
Loading composer repositories with package information
Updating dependencies
Nothing to modify in lock file
Installing dependencies from lock file (including require-dev)
Nothing to install, update or remove
Generating optimized autoload files
composer/package-versions-deprecated: Generating version class…
composer/package-versions-deprecated: …done generating version class
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Executing script cache:clear [OK] Executing script assets:install public [OK]

Nothing to unpack

I hope someone of you can help me.

Source: Symfony Questions