error executing basic fitting matlab

Hello ,

I'm trying to use basic fitting tools but every time i try to fit a curve i have this message :

Error executing Basic Fitting: Output arguement "pp" (and maybe others) not assignment during call to "C:\ProgramFiles\MATLAB\R2007b\toolbox\matlab\graph2d\private\bfitcalcfit.m(bfitcalcfit)".

Any idea what this means? and how i can get around this to get the curve fitting function working.

Thank you

[Joshua]

I realize this is three years late, but if anyone else runs into this problem this post addresses it in the comments: https://www.mathworks.com/matlabcentral/answers/134756-how-to-make-a-linear-regression-line