A family of Microsoft spreadsheet software with tools for analyzing, charting, and communicating data.
I often import from CSV files by doing Data -> From Text/CSV.
sometimes it will say, "[number] rows loaded. 1 error."
a) That creates a query to load the data. If you click Data \ Refresh All you can reload the data without any further steps. So if your source CSV file changes you don't have to import again! That's the sense behind.
If you don't like to have a query, simply right-click and delete it. The created table stays in the sheet.
b) Click on that text and Excel creates another query that shows the rows which contains the errors. In that query you'll see some "cells" that shows Error, select it and you'll get a preview and message what's the reason.
Andreas.