Hi there,
In your local version of the experiment, if you open experiment settings and under the ‘online’ tab it is likely that the field ‘output’ path is empty (which is now the case by default).
It is correct that in newer releases we encourage PsychoJS to search the root directory rather than the html (i.e. the default has changed).
You can see more on that in this post PsychoPy Builder not creating HTML folder 
Hope this helps,
Becca