Undefined is not an object (evaluating 'this._movie.play')

URL of experiment: Pavlovia
Description of the problem: I synchronized the experiment and started running it online. I can see the welcome and instructions. But when its going to start the experiment I receive the following error message: Type Error: Undefined is not an object (evaluating ‘this._movie.play’. I don’t have any object called ‘this’ or ‘movie’. Could you point me in the right direction? Thank you in advance!


Screen Shot 2022-04-13 at 9.58.38 PM

Do you have any movies in your experiment? What are they called?


Yes. I do have 119 movies in my experiment. About 3 sec each. It is a Lexical decision task where people have to answer if what they see is an American Sign Language sign or not. You can find the names of all my videos the attached spreadsheets. I erased the online project and created a new one. Now I am getting the error message that appears on the attached picture.

PracticeASLLDTStimulusVideosFilePath.xlsx (16.0 KB)
ASLLDTStimulusVideosFilePath.xlsx (19.9 KB)

The error message describes looking for the movie files on your Mac. The path to the files needs to be relative to the experiment file.

Could that be cause by the use of an external hard drive as the place to store all my project? I’m afraid my computer may face memory problems if I save everything in it. It alerted me of memory almost full before and I didn’t want it to crash while conducting my experiments. So I moved everything to a WD Passport and reattached the files from there.

I’m a bit confused because the experiments are running perfectly offline. So I’m not sure why its giving that problem online.


Or could it be related to this? I don’t know what “seed” is. But it appears as undefined for both.

I don’t think seed: undefined is relevant here.

What does the inside of your spreadsheet look like? What do your image components look like? One of them must be pointing at your external drive.

This is what the spreadsheet looks like. The VideosFilePath on column E is the one pointing to the stimulus videos folder. It is working just fine off-line. So I am not sure what is causing the issue.

The spreadsheet looks fine. How is VideoFilePath used?