struct to non struct error in integral calc

Hello , i am getting this error
"Struct contents reference from a non-struct array object."
its a simmpe formulas, why i am getting error?
Thanks
a = @(th)(((sin((x./2).*cos(th))./cos(th)).^2).*(besselj(0,(k.L.*sin(th)))).*(sin(th)).^3);
a1 = integral(a,0,pi);

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