Analyse following RPM build log snippet. Describe contents accurately, without speculation or suggestions for resolution.            
Your analysis must be as concise as possible, while keeping relevant information intact.
Snippet: 

ERROR: Command failed: 
 # /usr/bin/dnf5 --installroot /var/lib/mock/fedora-40-x86_64-1710410771.274888/root/ --releasever 40 install @buildsys-build --setopt=deltarpm=False --setopt=allow_vendor_change=yes --allowerasing --setopt=tsflags=nocontexts --setopt=tsflags=nocontexts --setopt=tsflags=nocontex
This snippet states that dnf5 command failed