Statistics 2Var Power curve fit

[KeithB]

I was playing with the curve fitting function/plotting and while trying the Power curve fit (bx^m) with the following data:
0 0
1 1
2 1.4
3 1.7
4 2
9 3
16 4
25 5
36 6

which should fit b=1, m= 0.5 pretty easily, I keep getting a "S1 - Error Insufficient statistics data"

The others work fine - though I cannot guarantee I have tried all of them...

What is wrong?