im getting errors when im entering command: npm start serve

[beljp]

im getting errors like this ERROR [unhandledRejection] { client: 'default', 7:50:46 PM operationType: 'query', operationName: 'getProducts', statusCode: 504, gqlErrors: [] }
and also this at the end

[beljp]

npm run preview is working for the homepage. Links aren't working