You will get an error if Flash Fill cannot find the pattern. The first thing to check is that you're using Flash Fill close to the source data (e.g., in the adjacent cell). For instance, it won't work ...

Have you ever spent hours perfecting your Excel spreadsheet, only to watch your carefully crafted formatting fall apart the moment you insert a new row? It’s a maddeningly common issue for Excel users ...

Conditional Formatting in Excel can be considered a valuable utility that can help visually enhance the data analysis and presentation in the spreadsheet by applying particular formatting based on pre ...