"RuntimeError startApplication() failed" (Qt)

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The application starts and then crashes or doesn't start at all when Squish attempts to start it. After a while Squish times out and adds an error message like the one shown below to the "Test Results" view in the Squish IDE:

RuntimeError: startApplication() failed

See "Application '...' couldn't be started. Starting application timed out after ..." (Qt) for more information.