If you are using thoughtbot’s Paperclip gem, make sure you have it properly configured for Solano CI. The most common problem is having the Paperclip command_path option set incorrectly.

In your config/initializers/paperclip.rb, make sure you set the command_path to /usr/bin. For instance:

# Set path to ImageMagick installation when using Solano CI
if ENV.member?('TDDIUM')
  Paperclip.options[:command_path] = "/usr/bin"