Installation Issue

Installation
1

How to solve this errors?

Problem 1
- Root composer.json requires atrocore/slim, it could not be found in any version, there may be a typo in the package name.
Problem 2
- Root composer.json requires atrocore/atrocore-legacy, it could not be found in any version, there may be a typo in the package name.

2

It looks like you are using composer installed on the server, but you should use composer.phar, which is provided by our software. Please follow the documentation provided with the software.