How can I solve this problem?

when I try to solve summation of double ontegration with a loop I got this error

Struct contents reference from a non-struct array object.

time_total=10; %100 seconds

dt=1; %step size in the t direction (time in seconds)

tmesh=0:dt:time_total; %iterates up to 100 seconds

tskip=2;

nt=length(tmesh);

for i = 1:nt ;

for p=1:10;

q (i) = integral2(@(phi,y) exp(-tmesh(i).*y./sin(phi)).*(1-y).^2.*cos(phi).^2.*sin(phi).*phi,0,pi/2,0,1);

V(i) = symsum(tmesh(i).p.^(tmesh(i)-1).*q(i));

end

end