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A Flask app in production crashes with an error: RuntimeError: Working outside of application context. What is a likely cause?

medium📝 Debug Q7 of 15
Flask - Deployment
A Flask app in production crashes with an error: RuntimeError: Working outside of application context. What is a likely cause?
ANot setting <code>FLASK_ENV=production</code>
BUsing debug mode in production
CRunning app with <code>app.run()</code> instead of Gunicorn
DTrying to access Flask features outside request or app context
Step-by-Step Solution
Solution:
  1. Step 1: Understand application context in Flask

    Flask requires an application context to access certain features like config or request.
  2. Step 2: Identify cause of RuntimeError

    Accessing these features outside a request or app context triggers this error.
  3. Final Answer:

    Trying to access Flask features outside request or app context -> Option D
  4. Quick Check:

    Application context error = A [OK]
Quick Trick: Use app/app_context() when accessing Flask features outside requests [OK]
Common Mistakes:
MISTAKES
  • Blaming debug mode for context errors
  • Thinking app.run() causes this error
  • Assuming environment variable fixes context issues

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