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: 
+ tar -xf /builddir/build/SOURCES/client-knative-v1.17.0-vendored-deps.tar.zst --strip-components=1
tar: This does not look like a tar archive
tar: Skipping to next header
tar: Exiting with failure status due to previous errors
This is the command the build errors on in %prep.