composer error

[rahulazm]

Hi,

Im getting error when I run this command composer require konekt/pdf-invoice

$ composer require konekt/pdf-invoice
You are running Composer with SSL/TLS protection disabled.
Using version ^1.3 for konekt/pdf-invoice
./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
- The requested package konekt/pdf-invoice No version set (parsed as 1.0.0) is satisfiable by konekt/pdf-invoice[No version set (parsed as 1.0.0)] but these conflict with your requirements or minimum-stability.

Installation failed, reverting ./composer.json to its original content.

Please advice.