UnboundLocalError in SR Research Builder Demo: EyelinkPicture_Builder.psyexp

Builder
1

Hello everyone,

I am a beginner in both Python and PsychoPy, so any detailed guidance would be greatly appreciated.

I’m experiencing an issue while running the “EyeLinkPicture_Builder” demo provided by SR Research in PsychoPy Builder. Below are the details of the problem:

Problem Description:
I encountered the following error message when trying to run the demo file:

File "S:\eyelink_devKit\EyeLink\SampleExperiments\Python\examples\Psychopy_examples\Builder\EyeLinkPicture_Builder\EyeLinkPicture_Builder_lastrun.py", line 1808, in <module>
run(
File "S:\eyelink_devKit\EyeLink\SampleExperiments\Python\examples\Psychopy_examples\Builder\EyeLinkPicture_Builder\EyeLinkPicture_Builder_lastrun.py", line 667, in run
    el_tracker.sendCommand(el_coords)
UnboundLocalError: local variable 'el_tracker' referenced before assignment
################ Experiment ended with exit code 1 [pid:29300] #################

PsychoPy Version: 2024.1.5
Operating System: Windows 11

Steps Taken:

  1. I have ensured that all necessary files and dependencies are in place.
  2. I have checked the script to see if el_tracker is properly initialized before being used.

To address the issue of validating file names, I made the following changes before encountering the el_tracker error:

#loop until we get a valid filename
while True:
    dlg = gui.Dlg(dlg_title)
    dlg.addText(dlg_prompt)
    dlg.addField('File Name:', edf_fname)
    # show dialog and wait for OK or Cancel
    ok_data = dlg.show()
    if dlg.OK:  # if ok_data is not None
        print('EDF data filename: {}'.format(ok_data['File Name:']))
    else:
        print('user cancelled')
        core.quit()
        sys.exit()

    # get the string entered by the experimenter
    tmp_str = dlg.data['File Name:']
    # strip trailing characters, ignore the ".edf" extension
    edf_fname = tmp_str.rstrip().split('.')[0]

    # check if the filename is valid (length <= 8 & no special char)
    allowed_char = ascii_letters + digits + '_'
    if not all([c in allowed_char for c in edf_fname]):
        print('ERROR: Invalid EDF filename')
    elif len(edf_fname) > 8:
        print('ERROR: EDF filename should not exceed 8 characters')
    else:
        break

Specifically, I changed ok_data[0] to ok_data['File Name:']and tmp_str = dlg.data[0] to tmp_str = dlg.data['File Name:']. Despite these changes, the error persists.

Any help or guidance on how to fix this error would be greatly appreciated. Thank you!

2

I may have made some naive mistakes, and I will reply in a short while

3

The pylink package should be compatible with the version of PsychoPy you are using. Make sure to check compatibility issues, especially when using demo files provided by SR Research.