How can I resolve the Convergence failure in DECIC?

Hi everyone,

I am trying to use ode15i to solve a system DAEs on the attached code. There seems to be a problem with my decic line. I get the error message:

Error using decic (line 108)
Convergence failure in DECIC.

Error in DAEExersize>fitodes (line 35)
[x0,xp0] = decic(@ReneeMchabeWaterDAE,0,x0,[1 1 0 0],xp0,[],options);

Error in lsqcurvefit (line 213)
            initVals.F = feval(funfcn_x_xdata{3},xCurrent,XDATA,varargin{:});

Error in DAEExersize (line 22)
cfit = lsqcurvefit(@fitodes,c0,t,y,lb,ub,options);

Caused by:
    Failure in initial objective function evaluation. LSQCURVEFIT cannot continue.

I have tried to change the values of x0, but I did not win. What can I try?

Regards

Dursman