Prevent Loss of Data -- Error Message Pops Up

What is this error message that is popping up when I try to insert a blank row of cells?

"To prevent possible loss of data, Excel cannot shift nonblank cells off of the worksheet. Select another location in which to insert new cells, or delete data from the end of your worksheet.

If you do not have data in cells that can be shifted off the worksheet, you can reset which cells Excel considers nonblank. To do this, press CTRL + End to locate the last nonblank cell on the worksheet. Delete this cell and all cells between it and the last row and column of your data then save."

This excel document we have has LARGE amounts of data and we can't afford to lose any of it.

-Brit

excel_error.png

I have attached an image for reference.

Ah I see. I'll give it a go! Thanks!