don't crash on empty files

1 files changed, 1 insertions, 1 deletions

diff --git a/oplot.py b/oplot.py
index 249d079..8d96fd1 100755
--- a/oplot.py
+++ b/oplot.py
@@ -364,7 +364,7 @@ class OverheadPlotter(defapp.App):
                 try:
                     plotters[plot_type](datafile, name, conf)
                 except IOError as err:
-                    self.err("Skipped '%s' (%s)." % err)
+                    self.err("Skipped '%s' (%s)." % (datafile, err))
                 break
         else:
             self.err("Skipped '%s'; unkown experiment type."