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5. Installation Troubleshooting

• 5.1. Upgrade Errors: "Command update is not defined" or Class Not Found
• 5.2. APP_URL is invalid
• 5.3. APP_KEY Missing during installation
• 5.4. Database Connection Error During Installation
• 5.5. Incorrect PHP Version
• 5.6. HelpSpot's 'storage' dir is not writable
• 5.7. Windows Virus Scanning Recommendations
• 5.8. Openssl_pkey_get_details() error when upgrading
• 5.9. Tinker Missing Upgrade Error