[Endoperez]

N�got Gick Fel is Swedish and means "something went wrong".
In the "barbarians.dm" text file, there's a line:

#flag "./haida/haidaflag.tga"

Which tells the program where to look for an image called "haidaflag.tga". Now it looks for it from the place where the original mod, Haida Gwaii (I hope I didn't butcher that) would put the file. You have to either install the original mod, or change the above line to:

#flag "./barbarians/haidaflag.tga"

The line is at the end of the barbarians.dm.