What is wrong with this matlab program?

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I have a homework question about a small-world network. My neuron model is FitzHugh Naguma (electrical coupling). I got this error ??? Error using ==> times Matrix dimensions must agree.

Error in ==> elec_syn_vr_swn at 42 I_syn = ( gsyn.* ( sum((Cshort).*con_mat,2).*x' - con_mat*x' ) )'; and small-world networks matlab codes are true or not? My program is:

%FHN Modeli_VR_Q_e_small-world_networks
clc;clf;clear;
deltat=0.01;
t=250;
j=0;
N=3;
con_mat=ones(N,N)-eye(N);   %all-to-all network
for B=0.0:0.001:0.04
    B
a=1.01;    
j=j+1;      
e=0.01;
A=0.01;                        
ohm=5;    
w=0.1;
x=-0.8*ones(1,3);       
y=-0.2*ones(1,3);
Isyn=zeros(1,3);
gsyn=0.1;  
Qsin=0;  
Qcos=0;
%SMALL_WORLD NETWORKS  
n=50;%number of nodes
k=4;%the nearest neighbor
p=0.5;%coupling probability
r=zeros(1,n);r(2:k+1)=1;r(n-k+1:n)=1;
C=toeplitz(r)
%subplot(2,2,1), spy(C)
%subplot(2,2,2)
v=find(rand(n,1)< p);
Cshort=sparse(v,ceil(n*rand(size(v))),ones(size(v)),n,n)
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%5
for i=1:t/deltat
    x=x+deltat.*(x - x.^3/3 -y -Isyn)./e;
    y=y+deltat.*(x +a +A.*cos(w*i*deltat) +B*cos(ohm*i*deltat) );
      I_syn = ( gsyn.* ( sum((Cshort)'.*con_mat,2).*x' - con_mat*x' ) )';
      Qv=x;
      Qv(find(Qv<0))=-1;
      Qvav=(1/N)*sum(Qv);
      Qsin=Qsin+2*Qvav(2)*sin(w*i*deltat);
      Qcos=Qcos+2*Qvav(2)*cos(w*i*deltat);
  end
Qsin=Qsin/(t/deltat);
Qcos=Qcos/(t/deltat);
Qson(j)=sqrt(Qsin^2+Qcos^2);
end
Bplot=0.0:0.001:0.04;
plot(Bplot,Qson,'-o'),
grid on;
xlabel('B');
ylabel('Q');