Roots Discourse

Provision works fine but deploy error in staging DO server

Every thing working good my server provision works fine for staging
I have changed all the necessary details for staging server deployment.
Like: repo address fine, deploy hosts address fine, ssh added to gitlab, deploy key added to gitlab,
but at the time of deploy it gives error in this step
Task[deploy : Install Composer dependencies]

Please provide the error.

I have give all the access

fatal: Could not read from remote repository.
", "
", " Please make sure you have the correct access rights

Make sure you’re forwarding your SSH key:

ssh-add -K

Yeah, I have enter this command but gives error.
Err: Could not open a connection to your authentication agent.

Have you started your ssh-agent?