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how to fit data with this specified functional form?


Dear all,
  I wanna fit my data with the function x^b where b is the parameter to
be determined. But mathematica just return me:
Input[2]:=     FindFit[data, x^b, b,x]
    "The Jacobian is not a matrix of numbers at {b} = {1.`}"
Output[2]:=   {b -> 1.}

I tried to fit another data with the same function x^b, this problem
dissapears, so I guess that's due to my data is quite linear?
but...How to avoid this problem and get a proper fit with the function
x^b ?  Thanks for any ideas!
     Best   Regards.          Bryan


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