Understanding the Error:
At its core, this error means Laravel cannot find its application key. But to really fix it, it helps to understand what this key does. Think of it as your application’s master password. The APP_KEY stored in your .env file is a random, 32-character string used for encryption and hashing across your entire project.
Laravel uses this key for several vital security functions:
Encrypting Cookies and Sessions:
It ensures that client-side session data is tamper-proof.
Securing User Passwords:
While passwords are hashed, the key contributes to the overall security salts.
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