gitk / diffcore-rename error message

Hi all,

I was trying to create a git repository in the following way (while importing different releases from clearcase tree)

git init . tar xzf version1.. git add . git commit -a -m"Version1" rm -rf tree tar xzf version2 git add . git commit -a -m"Version2" ... and so on for next next verison.

Now I get the following error while using gitk:
warning: too many files, skipping inexact rename detection
warning: too many files, skipping inexact rename detection
    while executing
"close $bdf"
    (procedure "getblobdiffline" line
...

which seems to come out of diffcore-rename.c

Can I ignore it? Is it harmful?

Thanks, Alf