What does 'error command failed with exit code 1' typically indicate when running 'yarn start'?

An 'error command failed with exit code 1' during `yarn start` generally signifies that a script or command specified in your `package.json`'s `start` section encountered a problem and terminated abnormally. Exit code 1 usually indicates a general error, meaning something went wrong during the execution of the command. This could be due to various factors, including syntax errors in the script, missing dependencies, permission issues, or runtime errors in the code.