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: 
RPM build errors:
    File not found: /builddir/build/BUILD/nut-2.8.3-build/BUILDROOT/usr/lib/systemd/system/enphase-monitor@.service
    File not found: /builddir/build/BUILD/nut-2.8.3-build/BUILDROOT/usr/libexec/enphase-monitor

shows that enphase-monitor was expected to build but it's missing