Error with fsolve call isoptimargdbl

I had the following error using Optimization Toolbox ver 6.2.1 with Matlab 8.0.0.783 (R2012b):

Undefined function 'isoptimargdbl' for input arguments of type 'cell'.

Error in fsolve (line 143)

msg = isoptimargdbl('FSOLVE', {'X0'}, x);

Error in meanflow (line 199)

X=fsolve(@syst, initguess, options, U1, p1, rho1, T1, mf, Qcalc, kdrop, Nc, m_jump, fl, mfc, Sc, Uc, split, spl_ratio, beta);

Could you tell me if it's something which depends on the sw versions? When I used the same code with Matlab R2012a I didn't get any error.

Answer 1

[Matt J]

Make sure your objective function syst is returning numbers and not other data types like function handles and cells. See also,

http://www.mathworks.com/matlabcentral/answers/68157-error-message-running-ga-solver