@Aeonglacial Thanks for your feedback! I’m the presenter from the Queryverse talk 
So my understanding is that CSVFiles.jl is working for you at this point? But the two errors you face are:
- You can’t load Queryverse.jl.
- ExcelFiles.jl doesn’t work for you, i.e. you get the error you pasted above.
Where there any other issues along the way? It would be great if you could let us know about those, even if you resolved them. Minimally it can help us improve our documentation. Even things that weren’t bugs, but just difficult for you to find out: please let us know, that kind of feedback really helps us improve things!
The issue 1) seems a installation issue. On what platform are you? Could you paste the exact error message you get? The most helpful place to post this is in a new issue over at GitHub - queryverse/Queryverse.jl: A meta package for data science in julia, but if that is too cumbersome, feel free to just post it here.
Issue 2) I’m less sure. The XLDateAmbiguous suggests that there is something in that file that makes the underlying python excel library choke. Is there a chance you could post the Excel file? The best place to post that would be an issue at GitHub - queryverse/ExcelFiles.jl: FileIO.jl integration for Excel files, but again, if that is too cumbersome, feel free to just post it here.
Apart from these bugs, you might find this helpful.