Error: Unexpected token 'e', "error retu"... is not valid JSON

SyntaxError: Unexpected token 'e', "error retu"... is not valid JSON
    at JSON.parse (<anonymous>)
    at parseJSONFromBytes (node:internal/deps/undici/undici:5852:19)
    at successSteps (node:internal/deps/undici/undici:5833:27)
    at fullyReadBody (node:internal/deps/undici/undici:4725:9)
    at process.processTicksAndRejections (node:internal/process/task_queues:105:5)
    at async consumeBody (node:internal/deps/undici/undici:5842:7)
    at async getLocations (file:///app/.output/server/chunks/_/ssr.mjs:1509:16)
    at async Object.loader (file:///app/.output/server/chunks/_/ssr.mjs:1600:23)
    at async runLoader (file:///app/.output/server/node_modules/@tanstack/router-core/dist/esm/router.js:978:48)
    at async file:///app/.output/server/node_modules/@tanstack/router-core/dist/esm/router.js:1057:25