I want to get the result of multi-matrix multiply like followed below,

but error "final value in for loop must be numeric or character"

(*n is arbitrary and B[1],B[2],...,B[n] have been obtained*)

A:=LinearAlgebra:-IdentityMatrix(n);
#using the multiplication operation of matrix
for i from 1 to n do
   A:=LinearAlgebra:-Multiply(A,B[i]);
od:

return A

help me 

thanks