Unexpected Error When Running Practice Experiment

Hi,

I'm new to the opensesame software so am not entirely confident when using it. When i finished the practice experiment (eye cue gazing), the software states that there is an error when i try and run the experiment. This message comes up and not sure what it means.

If anyone could help that would be great, thanks.

The experiment did not finish normally for the following reason:

Unexpected error
Details

item-stack: experiment[run].practice_loop[run].block_sequence[run].block_loop[run].trial_sequence[prepare].gaze_cue[prepare]
exception type: IOError
exception message: The picture file 'gaze_.png' does not exist
time: Mon Jan 08 17:01:14 2018
Traceback (also in debug window)

  File "C:\Program Files (x86)\OpenSesame\lib\site-packages\libqtopensesame\misc\process.py", line 150, in run
    exp.run()
  File "C:\Program Files (x86)\OpenSesame\lib\site-packages\libopensesame\experiment.py", line 411, in run
    self.items.execute(self.var.start)
  File "C:\Program Files (x86)\OpenSesame\lib\site-packages\libopensesame\item_store.py", line 91, in execute
    self.run(name)
  File "C:\Program Files (x86)\OpenSesame\lib\site-packages\libopensesame\item_store.py", line 106, in run
    self[name].run()
  File "C:\Program Files (x86)\OpenSesame\lib\site-packages\libopensesame\sequence.py", line 51, in run
    self.experiment.items.run(_item)
  File "C:\Program Files (x86)\OpenSesame\lib\site-packages\libopensesame\item_store.py", line 106, in run
    self[name].run()
  File "C:\Program Files (x86)\OpenSesame\lib\site-packages\libopensesame\loop.py", line 338, in run
    self.experiment.items.execute(self._item)
  File "C:\Program Files (x86)\OpenSesame\lib\site-packages\libopensesame\item_store.py", line 91, in execute
    self.run(name)
  File "C:\Program Files (x86)\OpenSesame\lib\site-packages\libopensesame\item_store.py", line 106, in run
    self[name].run()
  File "C:\Program Files (x86)\OpenSesame\lib\site-packages\libopensesame\sequence.py", line 51, in run
    self.experiment.items.run(_item)
  File "C:\Program Files (x86)\OpenSesame\lib\site-packages\libopensesame\item_store.py", line 106, in run
    self[name].run()
  File "C:\Program Files (x86)\OpenSesame\lib\site-packages\libopensesame\loop.py", line 338, in run
    self.experiment.items.execute(self._item)
  File "C:\Program Files (x86)\OpenSesame\lib\site-packages\libopensesame\item_store.py", line 90, in execute
    self.prepare(name)
  File "C:\Program Files (x86)\OpenSesame\lib\site-packages\libopensesame\item_store.py", line 122, in prepare
    self[name].prepare()
  File "C:\Program Files (x86)\OpenSesame\lib\site-packages\libopensesame\sequence.py", line 124, in prepare
    self.experiment.items.prepare(_item)
  File "C:\Program Files (x86)\OpenSesame\lib\site-packages\libopensesame\item_store.py", line 122, in prepare
    self[name].prepare()
  File "C:\Program Files (x86)\OpenSesame\lib\site-packages\libopensesame\sketchpad.py", line 117, in prepare
    element.draw()
  File "C:\Program Files (x86)\OpenSesame\lib\site-packages\libopensesame\sketchpad_elements\_image.py", line 64, in draw
    x=properties[u'x'], y=properties[u'y'], scale=properties[u'scale'])
  File "C:\Program Files (x86)\OpenSesame\lib\site-packages\openexp\_canvas\xpyriment.py", line 226, in image
    stim = stimuli.Picture(fname, position=(x,y))
  File "C:\Program Files (x86)\OpenSesame\lib\site-packages\expyriment\stimuli\_picture.py", line 47, in __init__
    unicode2str(filename)))
IOError: The picture file 'gaze_.png' does not exist