invalid json response body at http://localhost:3000/api/v1/rest/goal reason: Unexpected token < in JSON at position 0

FetchError: invalid json response body at http://localhost:3000/api/v1/rest/goal reason: Unexpected token < in JSON at position 0
    at D:\Aplicaciones\frontendserver\node_modules\node-fetch\lib\body.js:48:31
    at runMicrotasks (<anonymous>)
    at processTicksAndRejections (node:internal/process/task_queues:96:5)
    at async Promise.all (index 1)