What are common causes of 500 errors related to .env configuration on Hostinger?

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Grade: Education Subject: Support
What are common causes of 500 errors related to .env configuration on Hostinger?
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Incorrect database credentials (DB_DATABASE, DB_USERNAME, DB_PASSWORD), missing or incorrect API keys for services like Mailgun or Stripe, or typos in environment variables can all trigger 500 errors. Double-check your `.env` file for accuracy and ensure all required variables are present.