"Regression - LINEST() function returns error" mes

I'm trying to run a regression analysis in excel, but it keeps giving me this message: "Regression - LINEST () function returns error. Please check input ranges again." Basically, I have a whole bunch of historical data I'm running the Regression on. With all the historical data there, the regression runs just fine, but when I deleted some of the old data, it gave me this error message. I looked online for some solutions, and saw that it gives this error when there are blank cells, but I checked over and over again in the input ranges and there are NO blank cells. All of them are either populated with a 1 or 0. I even copied only the data I needed to run the regression analysis on to another spreadsheet, but it still gave me the same error. PLEASE HELP!!!! This is driving me crazy.