Invalid Names when Opening Workbook

Vivek received a workbook from a colleague and when he tries to open it he gets an error: "One or more invalid names were detected in this workbook. Those invalid names have been changed to #REF." This means he can't see some of the calculations. The same workbook is okay when sent to another colleague, so Vivek wonders why the workbook won't work for him but it does for his colleague.

This problem is probably due to one of two things. First, it is possible that your colleague's system has some add-ins loaded that allow the workbook to function properly, but you don't have them. The solution is to display, on your colleague's system, the add-ins that are being loaded. Write them on a piece of paper, start Excel on your system, and then make sure you have the same add-ins loaded.

The other possibility is that the workbook includes formulas that are linking to external data from other workbooks. It is entirely possible that your colleague's system has access to those other workbooks (either locally on his system or over the network) and you don't have access to them. The only way to determine this, again, is from your colleague's system. Have him load the workbook and look for external links it may contain. Figure out where that external data is located, and then make sure you have access to that same data on your system.