Seems like if the file has been removed from the repository, but still appears in the cvs log, statcvs tries to get the number of lines for the file and fails, as the file is not in the checked out copy of the repository.

The functionality of CVS integration is not implacted - the commits are still shown. However, the logged warnings are annoying.

Possible workaround might be to decrease the log level for statcvs to ERROR in log4j.properties:
log4j.category.net.sf.statcvs = ERROR, console