The experiment presents a series of short videos and asks participants to rate them using the slider. I previously uploaded a version of this experiment that mostly worked, but Pavlovia failed to play videos sometimes (blank screen instead of video, no error message came up, and the experiment proceeded as if the video had actually played). This was seemingly random - sometimes all videos played fine, and we didn’t notice any pattern in which failed to play on occasion.
I decided to start from scratch, deleted the old experiment, and try to re-upload as a new project. Now, no matter what I do, I get the same message when trying to launch a pilot:
"We could not find a record for experiment designer: undefined
Please check the name and try again. If the error persists, contact Pavlovia’s administrator."
I know others have written about this error message but none of the previous solutions appear to apply.