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: 
[2024-11-28 13:50:58,732][ ERROR][PID:3004741] Build failed: Backend process error: No success file => build failure
Build process didn't end in success state as no success file was written.