Errors in siteini

Hi,
I am getting errors in tv.burrp siteini for some channels. Are these serious?
 
channel 0520.SonyEntertainmentTV.in site -- TV.BURRP.COM -- update mode light
unable to update channel 0520.SonyEntertainmentTV.in

System.FormatException: String was not recognized as a valid DateTime.
  at System.DateTime.Parse (System.String s, IFormatProvider provider, DateTimeStyles styles) [0x00000] in <filename unknown>:0
  at System.DateTime.Parse (System.String s, IFormatProvider provider) [0x00000] in <filename unknown>:0
  at WebGrab.Program.UpdateChannel (System.String strIndex, WebGrab.ChannelToUpdate Chan, WebGrab.XmlTarget xTarget) [0x00000] in <filename unknown>:0
  at WebGrab.Program.Main (System.String[] args) [0x00000] in <filename unknown>:0