Why do some functions return “-” and not the expected data?

If a function returns “-” instead of the data you expected, it indicates that there was an error while scraping the data. To figure out exactly what went wrong, you can check the function metadata in the ImportFromWeb sidebar and acces the soyrce page as seen by the scraper. In the Monitor tab, go to the ‘Monitor a function’ section and select the cell with the error to see the details. You can then re-execute the function using the RUN button at the top of this same tab.

Monitor a function to see error details