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: 
Problem: cannot install both python3-packaging-24.2-3.fc42.noarch from fedora and python3-packaging-25.0-1.fc43.noarch from @System
  - cannot install the best candidate for the job
  - conflicting requests
The snippet shows the conflicting requirements.