Win 10, PsychoPy Builder 2025.1.1, Standalone. I am trying to push an experiment made in Builder to Pavlovia for the first time. I read different threads, instructions but I guess I am doing sth wrong. I did not plan to run the experiment online (PI asked me to transform it into a Pavlovia exp, “qu…

Hi, Thanks for the reply. How do I manually turn off the auto-translate in Builder? for the custom code components changed Auto-JS to JS everywhere. I read it specifically in this forum that custom code components should be manually altered, I should use sth else instead of pandas for reading in fil…

Hello @danna You can not use Python-libraries for online experiments. Take a look at the crib sheets by wakecarter. Best wishes Jens

Thanks. I made most of my manual changes based on those sheets / related threads. I know I cannot use Python libraries (I mentioned this in my previous response), the current code does not use any of these. Unfortunately, I am still stuck and don’t know how I could figure out what is wrong and what …

Hello @danna What is the error message when you try to run the experiment locally in a browser? I assume that the PsychoPy-Version runs without problems? Best wishes Jens

Hi, It runs. I tried to relocate the whole folder as there were special (russian) characters in the previous path, delete the experiment form Pavlovia, then push it again, creating a new project, but it did not help. When I tried to run the exp online and open the console to see what’s wrong, I see…

Hi, renaming and resynch-ing did not work. The page is not loaading “localhost did not send data”. I deleted and recreated the project a few times today, so this might have caused problems (seemingly the project disappeared but when trying to view the code of the next attempt, I saw that the last up…

Are you using a Variable component? If so, you will need to switch to a code component for it to run online. Do any of your code components set to Auto show JavaScript syntax errors? [image] Wakefield's Daily Tips Blog Use Auto → JS code components wherever p…

Hi, in the python version I do import libraries (pd, sound) but I rewrote the PsychoJS part in a way that I do not need them (code type set to Both). I started with the Auto-JS version, and only changed things that are supposed to be changed in PsychoJS, according to threads I read here… The experim…

Hello @danna [image] danna: For further info see 4210: Probable syntax error detected in your JavaScript code — PsychoPy v2025.2.4 Besides the VariableComponent which does not work online, try to fix above mentioned error. Follow the advice given by @wakecarter . Best wishes Jens

Problems with Pavlovia synchronization

Online experiments

wakecarter January 29, 2026, 10:09pm 10

Is this the name of your experiment? With all the copies you are making, the index.html file might be looking for the wrong JS file.

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Problems with Pavlovia synchronization

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