stringio gem version causing passenger to fail to start

When deploying with Passenger, errors such as below are shown.

# Error: The application encountered the following error: 
# You have already activated stringio 3.1.1, but your Gemfile requires stringio 3.1.0. 
# Since stringio is a default gem, you can either remove your dependency on it 
# or try updating to a newer version of bundler that supports stringio as a default gem. (Gem::LoadError)

The reason is that Passenger loads default gems which might be a different version that you specify in your Gemfile.

To change this behavior, the Passenger provides a config to disable it.

passenger_preload_bundler = off;

Once it is added, restart your application and the correct version of the stringio should be loaded.

Reference: https://www.phusionpassenger.com/docs/references/config_reference/nginx/#passenger_preload_bundler


AI Summary
gpt-4o-2024-05-13 2024-07-16 00:41:19
Errors with Passenger may occur due to version conflicts of the stringio gem. By default, Passenger loads its included gems, which can differ from those specified in your Gemfile. Disabling this behavior through the `passenger_preload_bundler` configuration resolves the issue.
Chrome On-device AI 2024-07-20 06:15:28

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