vercel error with post route

 2026-03-08 14:44:48.156 [error] Error: EROFS: read-only file system, open '/var/task/server/data/news.json'
    at Object.writeFileSync (node:fs:2427:20)
    at addNews (/var/task/server/services/newsService.js:34:18)
    at /var/task/server/routes.js:113:31
    at Layer.handleRequest (/var/task/node_modules/router/lib/layer.js:152:17)
    at next (/var/task/node_modules/router/lib/route.js:157:13)
    at Route.dispatch (/var/task/node_modules/router/lib/route.js:117:3)
    at handle (/var/task/node_modules/router/index.js:435:11)
    at Layer.handleRequest (/var/task/node_modules/router/lib/layer.js:152:17)
    at /var/task/node_modules/router/index.js:295:15
    at processParams (/var/task/node_modules/router/index.js:582:12)