# Nitro failing on Generate command to build
Types issue in $fetch
3.xpending triageneeds reproductionclosed-by-bot
[Nuxt 3.6.5] `nuxt build`, fail at Nitro step for "undefined"
3.xpending triage
404 error after running npm run build with app.baseURL set.
pending triageneeds reproduction
Nuxt Build Error (RegExp.prototype.exec)
pending triageupstreamneeds reproduction
upgrade nuxt 3.0.0 to 3.2.2 create error on dev server (reading 'port' of undefined)
3.xworkaround availablepending triageneeds reproduction
Vercel: 404 page returns JSON content
3.xpending triageneeds reproduction