Corrective Feedback (Picture as Feedback) in Psychopy - feedback

Question

I am creating an experiment with the PsychoPy Builder.
I have visual and auditory stimuli, the task is to learn associations between them.
When the participant presses the right key, the answer "Correct" appears. However, when the participant presses the wrong key, I would like to not only display "Wrong." But also: "The correct answer is ..." and then show the picture or the sound of the correct association.
I have created a routine that is called "Feedback". It contains the Code component, the Text component and the Picture component (or the sound component).
In the condition file (.xlsx), the picture (sound) that should be displayed is called "corrective_FB".
In the Code Component in "Begin Experiment", I have
message=''
In the Code Component I have written the following code in the "Begin Routine":
if Antwort_manuell.corr:#stored on last run routine
message="Richtig!"
else:
message="Ups, das war falsch. Die richtige Antwort wäre:"
Form_stimulus2.setImage(corrective_FB)
I guess, I am not doing the "display image" command correctly. How is the correct command? And how is it for an auditory stimulus?
When I run the experiment, it seems to work when I press the correct keypress (however, the picture is shown then, too and it should only be the text....), but when I press the wrong key, the experiment stops.
When I force it to end, I get the follwing message:
Running: C:\Dateien\Forschung\Experimente\Legasthenie_Crossmodal\Experiment\Visual_manual\Vis_Man_lastrun.py
Traceback (most recent call last)
File "C:\Dateien\Forschung\Experimente\Legasthenie_Crossmodal\Experiment\Visual_manual\Vis_Man_lastrun.py", line 406, in
Feedbacktext.setText(message)
File "C:\Program Files (x86)\PsychoPy2\lib\site-packages\psychopy-1.82.01-py2.7.egg\psychopy\visual\text.py", line 240, in setText
setAttribute(self, 'text', text, log)
File "C:\Program Files (x86)\PsychoPy2\lib\site-packages\psychopy-1.82.01-py2.7.egg\psychopy\tools\attributetools.py", line 100, in setAttribute
setattr(self, attrib, value) # set attribute, calling attributeSetter if it exists
File "C:\Program Files (x86)\PsychoPy2\lib\site-packages\psychopy-1.82.01-py2.7.egg\psychopy\tools\attributetools.py", line 20, in __set__
newValue = self.func(obj, value)
File "C:\Program Files (x86)\PsychoPy2\lib\site-packages\psychopy-1.82.01-py2.7.egg\psychopy\visual\text.py", line 231, in text
self.dict['text'] = unicode(text)
UnicodeDecodeError: 'ascii' codec can't decode byte 0xc3 in position 43: ordinal not in range(128)
Exception UnicodeDecodeError:

Answer 1

Thank you all for your help. I finally got it work. I indeed had to mark the message as a unicode string.
And I had to define more explicitly how the stimulus will be shown for correct and wrong answers.
I don't know, if I did it the most intelligent way, but it works. I am thankful for suggestions how it can be done more "beautifully", but this is how my code looks like now:
if Antwort_manuell.corr:#stored on last run routine
message="Richtig!"
Form_stimulus2.size = 0
else:
message=u"Ups, das war falsch. Die richtige Antwort wäre:"
Form_stimulus2.setImage(corrective_FB)
Form_stimulus2.size = 5
And for the sound the code is:
if key_tester.corr:#stored on last run routine
message="Richtig!"
sound_1.volume = 0
else:
message=u"Ups, das war falsch. Die richtige Antwort wäre:"
sound_1.setSound(corrective_FB)
sound_1.volume = 1