# Server Side Rendering Error: TypeError [ERR_UNKNOWN_FILE_EXTENSION]: Unknown file extension ".css"
How to Fix this problem when I run it after nuxt build
3.xpending triageneeds reproduction
HELP : Extension Error: The validator '__esModule' must be a function. (after buid)
3.xpending triageneeds reproduction
Unknown file extension ".css" using webpack bundler
3.xbugwebpack❗ p4-important