See this Adobe doc for information on this subject - see if this helps... Adobe Experience Manager Help | Developing Sling Model Exporters in AEM

Nice response Arun - like always!

Also - discussed here: Page Authoring with Content FragmentsIf you want to develop a custom component - then you should not use Content Fragments. You should use Sling Models and HTL.

Content Fragments act like a component - as discussed here - -Adobe Experience Manager Help | Working with Adobe Experience Manager Content FragmentsAs you can see - you drag a content fragment onto an AEM page - like other AEM components- such as a custom HTL component.

Can you post your model so community can view it. It will help in giving you suggestions.

This is not an AEM value. This is documented here - https://aws.amazon.com/blogs/security/wheres-my-secret-access-key/

They cover these types of MSM questions in this MSM webinar here -- Scott's Digital Community: January 2018 session of Ask the AEM Community Experts

Do you have a second AEM DEV instance. Try installing that package on that. It will tell us if issue is with Server or the actual package.

Refer to this KB for information about working with fonts with AEM -- Adobe Experience Manager Help | Make fonts available

The above answer seems to be the correct way to proceed here.