[igraph] problems with import of Pajek .net file

[Martin Tomko]

Hi All,
I am experiencing a problem reading a pjek formatted graph (that I 
output from my own conversion script). The graph opens fine in Pajek itself.

I get the following error:
Fehler in read.graph.pajek(file, ...) :
  At type_indexededgelist.c:245 : cannot add edges, Invalid vertex id

It is a very simple graph with no fancy attributes, just :

*Vertices 8309
1
2
3
4
5
6
...
*Edges
1 2
1 7044
10 985
100 1901
...

I have output many other .net graphs and ingested them into igraph 
without problems before, although from a different procedure and input, 
so it must be something with the new input graph data I have, I assume.

I made sure that the number of vertices is correct, they are numbered 
from 1, sequentially, and ordered in the output, and I also ordered the 
edges. I have no idea what could be the problem.
Is there a way to enable more verbose debug output from igraph in R, so 
that I see which vertex number is the problem?

the two graphs are available here, if anyone wants to try...:
http://www.geo.uzh.ch/~mtomko/myoutput.net
http://www.geo.uzh.ch/~mtomko/pajektest.net

Thanks
Martin