error in WebGrab++.log.txt

in my WebGrab++.log.txt logfile i get error messages (see bellow) for every channel i have put in my WebGrab++.config.xml.
But it seems like I get data for all the channels into my epeg xmltv file. So what is these error messages?

[Error   ] Could find existing channel (xmltv_id=NauticalChannel.se) in the config file
[Error   ] Could find existing channel (xmltv_id=Motors TV Europe.se) in the config file
[Error   ] Could find existing channel (xmltv_id=Barnkanalen.se) in the config file
[Error   ] Could find existing channel (xmltv_id=BBC1HD.uk) in the config file