bad source link in composer.json

[lorinczelod]

"source": "https://github.com/kartik-v/yii2-app-practical/"
should be
"source": "https://github.com/kartik-v/yii2-app-practical-a/"
(I think you changed the name first time to "name": "kartik-v/yii2-app-practical", and the consequence is the typo error belove...
)