hi all, i am new to graph tool, and i encounter a problem i got the performance test files from http://graph-tool.skewed.de/performance when i run gt_bench.py, it shows [zhaojun@fedora performance]$ python gt_bench.py Traceback (most recent call last): File "gt_bench.py", line 6, in <module> g = load_graph("pgp.xml") File "/usr/lib/python2.7/site-packages/graph_tool/__init__.py", line 2352, in load_graph g.load(file_name, fmt, ignore_vp, ignore_ep, ignore_gp) File "/usr/lib/python2.7/site-packages/graph_tool/__init__.py", line 1989, in load ignore_ep, ignore_gp)IOError: error reading from file 'pgp.xml':parse error: on line 1, column 0: not well-formed (invalid token) i have no idea whether it is something related with the formate of xml file or with the graph tool API i installed thanks Zhao Jun