Raised when Rack::ApplicationSpawner, Railz::ApplicationSpawner, Railz::FrameworkSpawner or SpawnManager was unable to spawn an application, because the application either threw an exception or called exit.

If the child_exception attribute is nil, then it means that the application called exit.

[RW] app_type
Public Class methods
new(message, child_exception = nil, app_type = "rails")
    # File lib/passenger/exceptions.rb, line 58
58:         def initialize(message, child_exception = nil, app_type = "rails")
59:                 super(message, child_exception)
60:                 @app_type = app_type
61:         end