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: 
version conflict for package "Tcl": have 9.0.0, need 8.6
    while executing
"package require Tcl 8.6"
    (file "test/tester.tcl" line 33)
Error message