📚 How to Resolve the dB.driver Configuration Error When Running the New E2E Local Evaluation Script

docs/debugging/how-to-resolve-the-dbdriver-configuration-error-when-running.md

@@ -0,0 +1,136 @@
+# How to Resolve the `dB.driver` Configuration Error When Running the New E2E Local Evaluation Script
+
+## Overview
+
+This guide explains how to locate and resolve a configuration error related to `dB.driver` that occurs when running the new end-to-end (E2E) local evaluation script. It consolidates the information shared in Slack into a clear, repeatable process.
+
+## Prerequisites
+
+- Access to the project repository containing:
+  - The new E2E local evaluation script
+  - Project documentation (including one or more `README` files)
+- A code editor or integrated development environment (IDE) capable of searching across all files (for example, Cursor, Visual Studio Code, JetBrains IDEs)
+- Basic familiarity with:
+  - Configuration files (for example, `.env`, `config.yml`, `config.json`)
+  - Running local scripts from the command line
+
+> Note: The original Slack discussion did not specify the exact repository name, directory structure, or the specific configuration file where `dB.driver` is defined. You may need to adapt the steps below to your project’s layout.
+
+## Steps to Locate and Fix the `dB.driver` Error
+
+1. **Identify the exact error message**
+
+   - Run the new E2E local evaluation script as you normally would.
+   - Copy the full error message that references `dB.driver` (or similar).
+   - This will help you confirm you are addressing the correct configuration issue.
+
+2. **Search documentation for `dB.driver`**
+
+   - Open your project in your editor/IDE.
+   - Use the “search in all files” feature to search for:
+     - `dB.driver`
+     - `db.driver`
+     - `driver` in combination with `db` or `database`
+   - Focus on:
+     - `README.md` files in the repository root and subdirectories
+     - Any `docs/` or `documentation/` directories
+
+   The Slack answer indicates that this error is documented in a README file, so you should find a section that:
+   - Mentions `dB.driver` (or a similar key)
+   - Describes how to configure it for local E2E evaluations
+
+3. **Locate the relevant configuration instructions**
+
+   - Once you find the README entry, read the surrounding section carefully.
+   - Look for:
+     - The name and path of the configuration file (for example, `config/local.yml`, `.env.local`, `e2e.config.json`)
+     - Required values for the `dB.driver` (or equivalent) setting
+     - Any environment variables that must be set
+
+4. **Update your configuration**
+
+   - Open the configuration file referenced in the README.
+   - Add or update the `dB.driver` (or equivalent) entry according to the documentation. For example (illustrative only):
+     ```yaml
+     dB:
+       driver: postgres
+       host: localhost
+       port: 5432
+     ```
+     or in an environment file:
+     ```bash
+     DB_DRIVER=postgres
+     ```
+   - Save the file.
+
+   > Important: The exact key name, structure, and valid values depend on your project. Use the README instructions as the source of truth.
+
+5. **Re-run the E2E local evaluation script**
+
+   - After updating the configuration, run the script again.
+   - Confirm that the `dB.driver` error no longer appears.
+   - If a new error appears, capture the full message for further troubleshooting.
+
+## Important Notes and Caveats
+
+- **Documentation location is not fixed**  
+  The Slack responses indicate that the relevant instructions are “in the readme” but do not specify which one. You may need to:
+  - Check multiple `README.md` files (for example, in `./`, `./e2e/`, `./scripts/`, `./docs/`)
+  - Search for related terms such as “local evals,” “E2E,” or “database configuration”
+
+- **Configuration may differ by environment**  
+  Some projects use different configuration files for local, staging, and production environments. Ensure you are editing the configuration file used by the “new E2E local evals” script (often named with `local`, `dev`, or `e2e`).
+
+- **Tooling limitations**  
+  The original question mentioned that Cursor was “not helpful in debugging.” Rely on full-text search across the repository and the project’s documentation rather than only on AI-assisted suggestions.
+
+## Troubleshooting Tips
+
+If the error persists after following the steps above:
+
+1. **Verify you edited the correct file**
+   - Confirm that the file you changed is actually loaded by the E2E local evaluation script.
+   - Check any startup or configuration-loading code for references to configuration paths or environment variables.
+
+2. **Check for typos and case sensitivity**
+   - Ensure the key name matches exactly what the application expects (`dB.driver` vs `db.driver` vs `DB_DRIVER`).
+   - Some configuration systems are case-sensitive.
+
+3. **Confirm environment variable loading**
+   - If the configuration uses environment variables:
+     - Ensure they are exported in your shell or defined in the correct `.env` file.
+     - Restart your terminal or development environment if necessary.
+
+4. **Search for related configuration keys**
+   - If `dB.driver` does not appear anywhere, search for:
+     - `database`
+     - `dbConfig`
+     - `connectionString`
+   - The error may be a derived message from a higher-level configuration wrapper.
+
+5. **Gather additional information if asking for help**
+   - When escalating to your team or support channel, provide:
+     - The full error message and stack trace
+     - The exact command you ran to start the E2E local evaluation script
+     - The relevant snippet from your configuration file (with secrets removed)
+     - The path and content of the README section you followed
+
+## Information That May Still Be Needed
+
+The Slack exchange does not specify:
+
+- The exact repository or directory structure
+- The precise configuration file name and path
+- The valid values for `dB.driver` in this project
+- The exact error text emitted by the script
+
+To create a fully precise guide, you would need:
+
+- The full error message as printed by the E2E local evaluation script
+- The specific README section that documents `dB.driver`
+- The configuration file path and an example of a working configuration block
+
+Once those details are known, they should be added to this document (for example, under “Steps to Locate and Fix the `dB.driver` Error”) to make it fully actionable for all users.
+
+---
+*Source: [Original Slack thread](https://distylai.slack.com/archives/impl-tower-infobot/p1736435334008259)*