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Error Bundler::HTTPError Could not fetch specs from https://rails-assets.org/

This content has been automatically translated from Ukrainian.
The resource is located at https://rails-assets.org/
So some builds may fail. Try using a different 'source' in the Gemfile.
Fetching source index from https://rails-assets.org/

Retrying fetcher due to error (2/4): Bundler::HTTPError Could not fetch specs from https://rails-assets.org/ due to underlying error <Errno::ECONNREFUSED: Failed to open TCP connection to rails-assets.org:443 (Connection refused - connect(2) for "rails-assets.org" port 443) (https://rails-assets.org/specs.4.8.gz)>

Retrying fetcher due to error (3/4): Bundler::HTTPError Could not fetch specs from https://rails-assets.org/ due to underlying error <Errno::ECONNREFUSED: Failed to open TCP connection to rails-assets.org:443 (Connection refused - connect(2) for "rails-assets.org" port 443) (https://rails-assets.org/specs.4.8.gz)>

Retrying fetcher due to error (4/4): Bundler::HTTPError Could not fetch specs from https://rails-assets.org/ due to underlying error <Errno::ECONNREFUSED: Failed to open TCP connection to rails-assets.org:443 (Connection refused - connect(2) for "rails-assets.org" port 443) (https://rails-assets.org/specs.4.8.gz)>

Could not fetch specs from https://rails-assets.org/ due to underlying error <Errno::ECONNREFUSED: Failed to open TCP connection to rails-assets.org:443 (Connection refused - connect(2) for "rails-assets.org" port 443) (https://rails-assets.org/specs.4.8.gz)>

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