# Dev server crashes after V4 migration with deno as build preset
dev server error 500 ERR_LOAD_URL if `app.buildAssetsDir` same as source directory name
pending triageupstream
Development server crashes after upgrading to 3.14
pending triagepossible regression
Opening Nuxt in a tab while dev server initialization breaks the build with cryptic error until server restarted
3.xpending triageneeds reproduction