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: YAML Exception reading /home/travis/build/faktaoklimatu/web-cz/web-core/collections/_studies/2023-reserse-vodik.md: (<unknown>): did not find expected key while parsing a block mapping at line 28 column 7
It shows the YAML error in the file "web-core/collections/_studies/2023-reserse-vodik.md" at line 28, column 7.