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Error message on Pavlovia since last platform update

This evening I noticed that any new projects I upload on Pavlovia yield the following error message when trying to run them:

Unfortunately we encountered an error:

  • when starting the experiment
  • when configuring PsychoJS for the experiment
  • missing psychoJsManager block in configuration

Try to run the experiment again. If the error persists, contact the experiment designer.

I know it’s not a problem of one specific experiment, because then I created a dummy project with only meaningless plain text and key presses just to see what happened and it also crashes straight away when launching it (here’s the link:

This seems to have coincided with the recent update to the platform which I noticed happened sometime today.

At least if I try to update the experiments I had uploaded until yesterday by syncing them, those still work fine, but I don’t seem to be able to get anything brand new to work. I would really appreciate it if someone could check if the recent update to Pavlovia has resulted in any bugs.

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There has been a fair bit of work on Pavlovia over the last week - we’re getting ready to release a new version with store/docs and hooks for further control over a running experiment - I’ll check whether any of the preparatory changes might have caused this.


OK, yes, Alain knows the cause and it should be fixed very very soon

Hello Sebastian,

As you correctly guessed, the issue stemmed from our recent update to both the Pavlovia server and the PsychoJs library, and had to do with backward compatibility when creating new projects.
I have just fixed it. As far as I can scertain, your test experiment is working just fine.


Thanks a lot! :slight_smile:

Yes, it’s all working fine now. Thank you!

Hi everyone, unfortunately the same problem appears also on lab.js projects:
I got the same message for a new project, originating from the labjs-pavlovia plugin 3.0.0 script. The old projects run just fine.

Thanks for any help!