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How to delete a repository from Pavlovia

I am very excited about Pavlovia. I do have a couple of questions that might seem silly!

  1. When I upload my experiment to Pavlovia using the menu or command, although a delete button is there in my account, it is not active! I do not know how can I delete an uploaded repository.

  2. When I activate and launch the experiment nothing showed up except a blank screen! Where am I wrong?

  3. I need to send markers via pylsl during the experiment and I already implemented it in my experiment. I wonder if Pavlovia supports pylsl.

Thank you!

  1. The delete button does not appear to be functional yet, but you can delete projects by accessing your project through Gitlab. You can get to your project on Gitlab by clicking on the “View code” button for your project in pavlovia or by going to Then, on the toolbar on the left, select Settings → General. Scroll all the way to the bottom of the page, and there is an “Advanced” section – click “Expand” (see screenshot below)

Scroll all the way to the bottom of the page again, and you’ll see the option to remove your project:

  1. There can be a few reasons for this. When you try to run your experiment, does the URL in your browser’s address bar say “about:blank”? If that’s the case, I’ve found that I just need to wait some time before the project properly updates. Come back to it in an hour and it will probably work. Of course, this could also be caused by an issue in your experiment. If you check the developer console of your browser, are there errors reported? If so, you’ll need to share those in order to diagnose the issue.

  2. The online experiments rely on javascript for all the dynamic functionality of the experiment. You can not use python in the browser, so the python package that you are using will not work online.

Thank you for your quick response.

  1. The solution works!

  2. Yes, the address bar shows “about:blank”. I am waiting for half an hour nothing shows up yet.

  3. Is there any suggestion to send the stimuli markers in the online version? How can I have lsl implemented in Pavlovia? That should be a question of many people who are using Psychopy and wanted to have an online version of their experiment.


  1. I’m not sure what causes this and how long it tends to take to begin working. To get around it, you can go directly to the study url by typing it in your browser’s address bar:

  2. Perhaps a developer can chime in here, but I’m not sure this is possible to do over the internet. From what I understand, you’re trying to send markers to hardware that is connected to the participant’s computer? If that’s the case, how can you be certain that the participant has the hardware necessary for the experiment? What hardware are you trying to interface with? My gut tells me that you might need to run a lab-based study rather than an online study.

  1. I think the online version still use the local resources. Although, the code is uploaded to Pavlovia, the stimuli will show up on a local machine. Markers are not necessarily hardware specific. It needs to be sent out via labstreaminglayer. Then, whatever hardware or software can receive it if connected to the labstreaminglayer. Probably this is more of a question from labstreaminglayer community.
    Your gut is right. I want to use Pavlovia for lab-based study.

Thanks for your response!

Sorry, I just came across this old thread.

I think the other issues are resolved but just wanted to mention about LabStreamingLayer. Kevin is right in thinking it can’t be done at present. LabStreamingLayer can’t be called from a script running in a browser so I’m afraid this is just not going to be possible fo the foreseeable future