[igraph] DL graph.read Error Msg

[Ragia .]

Hello,
Kindly,
I am trying to read the first example  in this page 

analytictech.com/networks/dataentry.htm

the example:
dl n=5
format = fullmatrix
labels:
barry,david,lin,pat,russ
data:
0 1 1 1 0
1 0 0 0 1
1 0 0 1 0
1 0 1 0 1
0 1 0 1 0


via
g=read.graph(file.choose(), format =  "dl" )

and got the following Error 
Error in .Call("R_igraph_read_graph_dl", file, as.logical(directed), PACKAGE = 
"igraph") : 
  At foreign.c:3039 : syntax error, unexpected EOFF, expecting NEWLINE or DIGIT 
in line 1, Parse error

thanks in advance
Ragia