error when use router handler in next js

⨯ TypeError: l.json is not a function at g (/var/task/.next/server/app/api/route.js:1:2707) at process.processTicksAndRejections (node:internal/process/task_queues:95:5) at async /var/task/node_modules/next/dist/compiled/next-server/app-route.runtime.prod.js:6:42484 at async eI.execute (/var/task/node_modules/next/dist/compiled/next-server/app-route.runtime.prod.js:6:32486) at async eI.handle (/var/task/node_modules/next/dist/compiled/next-server/app-route.runtime.prod.js:6:43737) at async Y (/var/task/node_modules/next/dist/compiled/next-server/server.runtime.prod.js:16:24556) at async Q.responseCache.get.routeKind (/var/task/node_modules/next/dist/compiled/next-server/server.runtime.prod.js:17:1025) at async r3.renderToResponseWithComponentsImpl (/var/task/node_modules/next/dist/compiled/next-server/server.runtime.prod.js:17:507) at async r3.renderPageComponent (/var/task/node_modules/next/dist/compiled/next-server/server.runtime.prod.js:17:4780) at async r3.renderToResponseImpl (/var/task/node_modules/next/dist/compiled/next-server/server.runtime.prod.js:17:5363)