# X_ASSET_VARIANT_UNDECLARED

## Means

an /assets image variant responsiveImage() never mints

## Typical cause

?w=, ?f= or ?q= on a hashed /assets URL names a width, format or quality outside the declared set for that source (usableWidths over DEFAULT_WIDTHS, DEFAULT_FORMATS, no quality), or the file is not a raster the pipeline decodes

## Fix

`responsiveImage({ src: asset('assets/hero.png'), width, height, alt })` — no widths/formats override for a site asset; an upload under /media answers any width

[CLI and verify](/error-codes#cli-and-verify)