A Problem about using matlab toolbox "delsig" to d

Hi, everybody. I am using matlab toolbox "delsig" to do the system design of a second order ADC.

In the "delsig" toolbox, function " realizeNTF ( ntf, form, stf ) " can set the coefficients for a particular modulator topology. It works perfectly with default input "stf=1", but when I set the stf has the same poles as ntf, Matlab gives me an error message for running this function. Did anybody meet the same problem, and has a solution. Thanks.

The matlab code is shown below:
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OSR=128; %over sampling rate

order =2; %the order of SDM

ntf0=synthesizeNTF(order,OSR,1); %create the optimized ntf.
stf0=ntf0; %copy the ntf to stf, so that they will have the same poles.
stf0.z=[]; %set the numerator of stf to 1.

form='CIFB';
[a,g,b,c]=realizeNTF(ntf0,form,stf0);
************************

here is the error message of matlab:
***********************
??? Error using ==> mrdivide
Matrix dimensions must agree.

Error in ==> realizeNTF at 327
b = real(x/A);

Error in ==> Test_7755_NTF_Cap2 at 10
[a,g,b,c]=realizeNTF(ntf0,form,stf0);
***********************

I downloaded the "delsig" toolbox from:
**broken link removed**