Installing PayPal module with composer fails

Hello Friends,

I have problem with the command composer require oxid-esales/paypal-module:dev-master
I tried everything and always this Exception is showing…

Could Someone tell what is my mistake ?

Thank You .

have you installed composer.json before or did you composer update?

Yes i think the composer is already installed

please make php composer.phar update first. does this work?

I still have problem i don’t know why.
composer.json is in root directory, the composer.phar is installed and is up to date

installing/updating latest composer.json was successfull?

Yes the composer.json is updated successfully

ok. please try this: composer require oxid-esales/paypal-module