How can I troubleshoot the 'cannot find module /app/dist/main' error during a Docker build?

Several steps can help troubleshoot this. First, verify the build command is correct and points to the correct build script. Check your `package.json` file for the build script (e.g., `build: npm run build`). Secondly, ensure the `dist` directory actually exists in your project and contains the expected `main` file. Thirdly, double-check your `tsconfig.json` (for TypeScript) or similar configuration file to ensure the output directory is correctly set. Finally, check the Dockerfile for any commands that might be interfering with the build process.