It is normal that you have this error, because it does not find the way exact of the file "ioFTPD.log" in iobanane.tcl so that your eggdrop functions correctly. You look in iobanane.tcl at this place like below and you remake it.
################################################## #############################
# FILES #
################################################## #############################
set ioBvar(ioBanana) "c:/ioFTPD/scripts/oBanana.exe" ;# Not used on a *nix box
set ioBvar(ftpdir) "c:/ioFTPD/"
set ioBvar(iolog) "c:/ioFTPD/logs/ioFTPD.log"
set ioBvar(nfo_log) "c:/ioFTPD/logs/nfos.log"
@+
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