Using the "fit" function with "mFct" ?

having a problem with declaring a function and using it in a nonlinear least squares fit:
function Fit5(a,x,y)
rslt5 = a[1]*(2.0*besselj(sqrt(.....;
return rslt5;
end function;
[a, res1, q1, qVar1] = fit(g, Top_data, fit5, guess,,,iterMax,w,rho );
getting the following error message:
is not a valid signature for the function"fit"

having a problem with declaring a function and using it in a nonlinear least squares fit:
function Fit5(a,x,y)
rslt5 = a[1]*(2.0*besselj(sqrt(.....;
return rslt5;
end function;
[a, res1, q1, qVar1] = fit(g, Top_data, fit5, guess,,,iterMax,w,rho );
getting the following error message:
is not a valid signature for the function"fit"

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