Hello KatrinR
you have a folder called index.html in your repository. Delete this folder and try syncing again. Pavlovia expects an index.html and two .js-files (experimentname-legacy-browers.js, experimentname.js) in the root-folder of the experiment.
Did you specify an Output path in the online tab of the Experiment properties? If so, leave this line blank.
As long as Pavlovia does not know the software platform and the platform version, your experiment won’t run online.
Best wishes Jens