How to correct ??? Error using ==> times Matrix dimensions must agree? plz help me?

Question

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I am using a formula its showing error inthe line Error in ==> pp at 134

A =(((beta').*(beta))+((0.9997).*(eye(2)))); %noise variance is assumed = 1
for k = 1:40
  lem=zeros(0,3779);
for n = 0:3779
lem(k,n+1)= 1-(exp(-2j*pi*(n/3780))+exp(2j*pi*(n/3780))); %lemda_i
end
end
thetha=zeros(1,3779);
for n = 0:3779
thetha(n+1,1) = 1;
thetha(n+1,2) = n; %thetha_n
end
beta = lem*thetha; %beta_i
y_p = cen_plts;
A =(((beta').*(beta))+((0.9997).*(eye(2)))); %noise variance is assumed = 1
B = inv(A);
C = (beta') * (y_p.');
rho_cap = B/C;
h_inl = thetha * rho_cap;
g_i = sum(h_inl)/3780;
G_i = g_i * eye(3780);
x_ik=zeros(1,3780);
plot(x_ik);
figure;