you posted a pilot-link. However those expire after one hour. If you want you have to access to your repository. Pavlovia can’t find the WAJT.xlxs. So, it is probably not uploaded. First thing to do, is to check for typos. PsychoPy is more flexible than PsychoJS concerning typos. It “guesses” file-endings and ignores case which PsychoJS does not.