fatal: Could not read from remote repository. when deploy

[BunnyWeee]

hi, I have encountered a problem when I just deploy my repo with GitHub action.
I have no idea what the problem probably is. Hope somebody can discuss with me.
really appreciate it.

refer log below:

00:53 bundler:install
      01 RBENV_ROOT=/usr/local/rbenv RBENV_VERSION=2.4.2 /usr/local/rbenv/bin/rbenv exec bundle install --path /home/apps/MyApp/shared/bundle --without development test --deployment --quiet
      01 ERROR: Repository not found.
      01 fatal: Could not read from remote repository.
      01 
      01 Please make sure you have the correct access rights
      01 and the repository exists.
      01 ERROR: Repository not found.
      01 fatal: Could not read from remote repository.

My guess is there are private gems in my repo.
Before deploy, I need to set up my ruby app first, I already handled about private gems with setting ssh-keys
Also, I need bundle install my app before deploy, and already pass it.
I thought I should already have enough permission about private gems.
Can't understand about no access rights here.