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: 
/usr/bin/tar: This does not look like a tar archive
gzip: stdin: not in gzip format
/usr/bin/tar: Child returned status 1
/usr/bin/tar: Error is not recoverable: exiting now
Error message