Your requirements could not be resolved to an installable set of packages.

[copeugne]

composer require vantoozz/proxy-scraper:~2 php-http/guzzle6-adapter hanneskod/classtools I have this output :

Using version ^1.2 for hanneskod/classtools
./composer.json has been updated
Loading composer repositories with package information
Updating dependencies (including require-dev)
Your requirements could not be resolved to an installable set of packages.

  Problem 1
    - Can only install one of: vantoozz/proxy-scraper[v2.0.0, dev-master].
    - Can only install one of: vantoozz/proxy-scraper[v2.0.1, dev-master].
    - Can only install one of: vantoozz/proxy-scraper[v2.1.0, dev-master].
    - Installation request for vantoozz/proxy-scraper dev-master -> satisfiable by vantoozz/proxy-scraper[dev-master].
    - Installation request for vantoozz/proxy-scraper ~2 -> satisfiable by vantoozz/proxy-scraper[v2.0.0, v2.0.1, v2.1.0].

What can I do to fix it ?