Problems with launching a new online experiment

URL of experiment:

Description of the problem:


I’ve just uploaded a new project on Pavlovia from the Psychopy builder (title of the project: Metacognitive Aspects of the Ability to Discriminate Emotional Facial Expressions). All the essential pieces of code and folders were apparently uploaded successfully. However, when I try to pilot the experiment from Pavlovia website, I receive the following message:

'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.’

Same thing when I try to launch it from the builder (I get the ‘404 Not Found’ error message). I must have done something wrong, as this is the first time I use Pavlovia, but I’m not sure what.

Many thanks in advance,