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: 
>           assert(installed.metadata_version == '2.4')
E           AssertionError: assert '2.3' == '2.4'
E             
E             - 2.4
E             + 2.3
Installed metadata are in incorrect version