Error mirroring screenshots: Child process exited with code 1

Hello,

I am building Veusz.

But I got this error, I don’t understand what it mean.

From /srv/buildbot/worker/build-x86_64-4/build/.flatpak-builder/git/https_github.com_veusz_veusz

* [new tag] veusz-3.3.1 -> veusz-3.3.1

FB: Running: git rev-parse veusz-3.3.1

FB: Running: git rev-parse --verify --quiet 5ea57fe18b1470873758df0223694131475b9758:.gitmodules

FB: unmounting rofiles-fuse /srv/buildbot/worker/build-x86_64-4/build/.flatpak-builder/rofiles/rofiles-aJIzUU

Committing stage bundle-sources to cache

Mirroring screenshots from appdata

e]2;flatpak-builder: Mirroring screenshotsaFB: Running: flatpak build --die-with-parent --nofilesystem=host --filesystem=/srv/buildbot/worker/build-x86_64-4/build/builddir --filesystem=/srv/buildbot/worker/build-x86_64-4/build/.flatpak-builder/screenshots-cache --share=network /srv/buildbot/worker/build-x86_64-4/build/builddir appstream-util mirror-screenshots /srv/buildbot/worker/build-x86_64-4/build/builddir/files/share/app-info/xmls/io.github.veusz.Veusz.xml.gz https://dl.flathub.org/repo/screenshots/io.github.veusz.Veusz-test /srv/buildbot/worker/build-x86_64-4/build/.flatpak-builder/screenshots-cache /srv/buildbot/worker/build-x86_64-4/build/builddir/screenshots/io.github.veusz.Veusz-test

bwrap: execvp appstream-util: No such file or directory

Error mirroring screenshots: Child process exited with code 1

FB: unmounting rofiles-fuse /srv/buildbot/worker/build-x86_64-4/build/.flatpak-builder/rofiles/rofiles-aJIzUU

program finished with exit code 1

elapsedTime=1404.355812

Thanks.

I fix it, the appdata is malformed.