Experiment not working on Pavlovia: variable is not iterable (cannot read property undefined)

[laurajspeed]

If this template helps then use it. If not then just delete and start from scratch.

OS (e.g. Win10): Windows
PsychoPy version (e.g. 2024.2.4 Py 3.8): 20251.1
Standard Standalone Installation? (y/n) y
URL of experiment:

Pavlovia

Laura Speed / BlurInvert

Do you want it to also run locally? y
What are you trying to achieve?:

My experiment works fine locally, but when I try to run it on Pavlovia I get the following error:

BlurStartSAMPLE is not iterable (cannot read property undefined)

This is a variable in my Trials.xlsx file, and used in the code component in the Stimulus routine.

What did you try to make it work?:

I have been trying lots of things today with various different problems occurring when trying to run the experiment on Pavlovia.

I have tried pushing the experiment from an older version of PsychoPy but then I get different problems.

It would be fantastic if someone could take a look at my experiment for me.

Link to the most relevant existing thread you have found:

TypeError: page.elements is not iterable

URL of experiment: Pavlovia Survey 2024.2.0 Survey Id: #94f51466-554f-4658-8960-ff96f9370aaf Username: pbirch Description of the problem: When trying to open the URL for my survey I’m faced with the following error message: Unfortunately we encountered the following error: when setting the model of Survey: survey TypeError: page.elements is not iterable Try to run the experiment again. If the error persists, contact the experiment designer.

What specifically went wrong when you tried that?:
My experiment does not contain an element like what was described in the previous post.

[wakecarter]

Your experiment current has platform 3.2 which I’m guessing means that you’ve pushed it with a pre 2020 version. Please start by using a more recent version.

Although I couldn’t open your psyexp file I did spot <Param name="Begin Routine" updates="constant" val="ImageSample = Image_SAMPLE + str(int(BlurStartSAMPLE)) + &quot;.jpg&quot;&amp;#10;" valType="extendedCode"/> which suggests that you have a text component set to constant which should update each routine.

[laurajspeed]

BlurInvert.psyexp (74.3 KB)

Thank you so much for your quick response! Indeed I had uploaded with an older version because I was receiving a different error message when I tried to push with the 2025 1.1 version. When I try to push it I get this error:

“Traceback (most recent call last):

File “C:\Users\u789160\AppData\Local\Programs\PsychoPy\lib\site-packages\psychopy\app\builder\builder.py”, line 1621, in onPavloviaSync

pavlovia_ui.syncProject(parent=self, file=self.filename, project=self.project)

File “C:\Users\u789160\AppData\Local\Programs\PsychoPy\lib\site-packages\psychopy\app\pavlovia_ui\project.py”, line 854, in syncProject

project.sync()

File “C:\Users\u789160\AppData\Local\Programs\PsychoPy\lib\site-packages\psychopy\projects\pavlovia.py”, line 916, in sync

self.firstPush(infoStream=infoStream)

File “C:\Users\u789160\AppData\Local\Programs\PsychoPy\lib\site-packages\psychopy\projects\pavlovia.py”, line 1155, in firstPush

info = self.commit(

File “C:\Users\u789160\AppData\Local\Programs\PsychoPy\lib\site-packages\psychopy\projects\pavlovia.py”, line 1321, in commit

info = self.repo.git.commit('-m', message)

File “C:\Users\u789160\AppData\Local\Programs\PsychoPy\lib\site-packages\git\cmd.py”, line 986, in

return lambda \*args, \*\*kwargs: self.\_call_process(name, \*args, \*\*kwargs)

File “C:\Users\u789160\AppData\Local\Programs\PsychoPy\lib\site-packages\git\cmd.py”, line 1599, in _call_process

return self.execute(call, \*\*exec_kwargs)

File “C:\Users\u789160\AppData\Local\Programs\PsychoPy\lib\site-packages\git\cmd.py”, line 1389, in execute

raise GitCommandError(redacted_command, status, stderr_value, stdout_value)

git.exc.GitCommandError: Cmd(‘C:\Users\u789160\AppData\Local\Programs\PsychoPy\MinGit\cmd\git.exe’) failed due to: exit code(1)

cmdline: C:\Users\u789160\AppData\Local\Programs\PsychoPy\MinGit\cmd\git.exe commit -m Push initial project files

stdout: 'On branch master

nothing to commit, working tree clean’“

I uninstalled and reinstalled Psychopy but I still get this same error message.

The ImageSample code I have is used to change the image with each loop, and as far as I can tell it is set to “set every repeat“. I have added the psyexp file here so hopefully you can open it now.

Do you have an idea what’s going wrong?

Thanks again!

[wakecarter]

I think that “nothing to commit, working tree clean” means it couldn’t generate JS files.

I think that the reason for that is your function code in End Routine.

I recommend that you define functions in Before Experiment in the format:

Python

def function1(x): 
    if x == 31:
        x = 30
    elif x == 1:
        x = 2
    return(x)

JavaScript

function function1(x) {
    if (x === 31) {
        x = 30;
    } else if (x === 1) {
        x = 2;
    }
    return x;
}

Secondly, BlurStartSAMPLE is in your Excel file so don’t change its value in the code.

Wakefield's Daily Tips

Don’t modify spreadsheet variables If you have a situation where you sometimes use the value of a variable from a spreadsheet in a component and sometimes want to change the value, copy the value to a different variable. Editing the spreadsheet variable causes an error online. Locally, something like this will work: if imageFile == 'x': # where imageFile comes from a spreadsheet imageFile = 'transparent.png' To ensure online compatibility, do this instead: if imageFile == 'x': # where i…

[laurajspeed]

Hello again,

After a weekend break, I understand what you suggested. Now I have tried to define the functions before the experiment, but they don’t seem to work now. I see that the experiment is recording my keyboard response, but that doesn’t lead to a change in blur level like it used to.

Do you have time to take a look again at my changes?

Thanks,

Laura

Trials.xlsx (17.5 KB)

BlurInvert.psyexp (74.2 KB)

[laurajspeed]

Another update. I have the function working again and the variable from my Excel file no longer updates during the experiment. But I’m still unable to push the experiment to Pavlovia.

BlurInvert.psyexp (73.9 KB)

[wakecarter]

If you add me as a developer to the repository and unprotect your master branch I could try to sync it for you (Settings / Repository / Protected Branches in Gitlab).

[laurajspeed]

Thank you. I think I have done it now!

Somehow I managed to push to Pavlovia now, but the experiment is still not running:

Laura Speed / BlurInvert

[wakecarter]

Hi,

You’ve set the project to public. Please could you add me as a developer?

Members · Laura Speed / BlurInvert

It looks like you have html as the output folder.

Wakefield's Daily Tips

Output path should be blank In PsychoPy version 2020.1, the files needed for running an experiment online were created in a sub-folder of the experiment folder, usually called html, along with copies of any necessary resources (spreadsheets, media files, etc.). Since version 2020.2.0 this has no longer been necessary, which saves on server space. More recent versions of PsychoPy will fail with resource errors if you try to use an output path. Delete the contents of Experiment Settings / Online…

[laurajspeed]

You should be added now.

I didn’t have html as output earlier. It was something I changed recently in an attempt to fix the problem

[wakecarter]

Ok. Please could you now switch it to inactive and back to piloting (only the owner can do this)?

[laurajspeed]

Done!

[wakecarter]

Now it runs and gives the error

{“origin”:“WindowMixin._getLengthPix”,“context”:“when converting a length from stimulus unit to pixel units”,“error”:“unable to deal with unit: degFlat”}

Units must be height, norm or pixels to work online.

Wakefield's Daily Tips

Use height units If you are using a head rest or controlled environment where you have set up the monitor details in the PsychoPy monitor centre then feel free to use cm or degrees. This is particularly recommended if you are presenting stimuli to two screens. On the other hand, if you aren’t controlling the distance between the participant and the computer or are running your study online, I would recommend using height units rather than pix or norm. In norm units the screen is 2 x 2 (bottom …

[laurajspeed]

Thank you. I changed the units to height, in a new experiment called “BlurInvert_height“ but it still won’t push and gives the error below:

Traceback (most recent call last):
File “C:\Users\u789160\AppData\Local\Programs\PsychoPy\lib\site-packages\git\cmd.py”, line 1262, in execute
proc = safer_popen(
File “C:\Users\u789160\AppData\Local\Programs\PsychoPy\lib\site-packages\git\cmd.py”, line 281, in _safer_popen_windows
return Popen(
File “C:\Users\u789160\AppData\Local\Programs\PsychoPy\lib\subprocess.py”, line 971, in init
self._execute_child(args, executable, preexec_fn, close_fds,
File “C:\Users\u789160\AppData\Local\Programs\PsychoPy\lib\subprocess.py”, line 1456, in _execute_child
hp, ht, pid, tid = _winapi.CreateProcess(executable, args,
FileNotFoundError: [WinError 206] De bestandsnaam of -extensie is te lang

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
File “C:\Users\u789160\AppData\Local\Programs\PsychoPy\lib\site-packages\psychopy\app\builder\builder.py”, line 1621, in onPavloviaSync
pavlovia_ui.syncProject(parent=self, file=self.filename, project=self.project)
File “C:\Users\u789160\AppData\Local\Programs\PsychoPy\lib\site-packages\psychopy\app\pavlovia_ui\project.py”, line 854, in syncProject
project.sync()
File “C:\Users\u789160\AppData\Local\Programs\PsychoPy\lib\site-packages\psychopy\projects\pavlovia.py”, line 916, in sync
self.firstPush(infoStream=infoStream)
File “C:\Users\u789160\AppData\Local\Programs\PsychoPy\lib\site-packages\psychopy\projects\pavlovia.py”, line 1154, in firstPush
self.stageFiles(infoStream=infoStream)
File “C:\Users\u789160\AppData\Local\Programs\PsychoPy\lib\site-packages\psychopy\projects\pavlovia.py”, line 1303, in stageFiles
self.repo.git.add(diffsDict[‘untracked’])
File “C:\Users\u789160\AppData\Local\Programs\PsychoPy\lib\site-packages\git\cmd.py”, line 986, in
return lambda *args, **kwargs: self._call_process(name, *args, **kwargs)
File “C:\Users\u789160\AppData\Local\Programs\PsychoPy\lib\site-packages\git\cmd.py”, line 1599, in _call_process
return self.execute(call, **exec_kwargs)
File “C:\Users\u789160\AppData\Local\Programs\PsychoPy\lib\site-packages\git\cmd.py”, line 1276, in execute
raise GitCommandNotFound(redacted_command, err) from err
git.exc.GitCommandNotFound: Cmd(‘C:\Users\u789160\AppData\Local\Programs\PsychoPy\MinGit\cmd\git.exe’) not found due to: FileNotFoundError(‘[WinError 206] De bestandsnaam of -extensie is te lang’)
cmdline: C:\Users\u789160\AppData\Local\Programs\PsychoPy\MinGit\cmd\git.exe add BlurInvert_height-legacy-browsers.js BlurInvert_height.js BlurInvert_height.psyexp

error message continues listing all the image files

[wakecarter]

Each folder online can only have one experiment file.

[laurajspeed]

In the new version that I tried, there is only one experiment file in the folder. Nothing is on GitHub because it wouldn’t synchronize.

[wakecarter]

Can you edit and sync the one I helped with?

[laurajspeed]

No I can’t get it to sync from PsychoPy. When I try it says a folder exists with that name already so I need to use a different name. Is there a way to sync that doesn’t go via Pavlovia?

[wakecarter]

Wakefield's Daily Tips

Don’t delete your repository I know it can be frustrating when there are synchronisation errors between your local PsychoPy folder and its GitLab repository, but please resist the temptation to delete the repository on GitLab and start again. The main reasons to avoid this are: It often doesn’t solve the issue. You will have to find and delete the local git files and folders. There is a risk that you will accidentally delete all of your projects or even all of your group’s projects. You will l…

[laurajspeed]

Thanks. I just tried this. But after editing the experiment file (to use height), it wouldn’t sync again. I created a new simple experiment to test and that did sync with Pavlovia so it’s something specific to this experiment. Could it be due to the large number of images I have?