nlcom command after nlsur AIDS estimation doesn't run - no error appears

Dear all,

I've trying to estimate a demand system of 7 beverages through the AIDS model using the nlsur command. It seems the program I specified works well because no error appears. After the nlsur estimation, I was trying to estimate the omitted equation/missing coefficients using nlcom command, which I haven't been able to. After I ran the codes, it appears "end of do-file" but there is no outcomes or error to know what is happening. I need help please. Any suggestion is much appreciated. Below, I copied the codes.

nlcom (a1:_b[/a1]) (a2:_b[/a2]) (a3:_b[/a3]) (a4:_b[/a4]) (a5:_b[/a5]) (a6:_b[/a6]) ///
(a7:1-_b[/a1]-_b[/a2]-_b[/a3]-_b[/a4]-_b[/a5]-_b[/a6]) ///
(b1:_b[/b1]) (b2:_b[/b2]) (b3:_b[/b3]) (b4:_b[/b4]) (b5:_b[/b5]) (b6:_b[/b6]) ///
(b7:-_b[/b1]-_b[/b2]-_b[/b3]-_b[/b4]-_b[/b5]-_b[/b6]) ///
(g11:_b[/g11]) (g12:_b[/g12]) (g13:_b[/g13]) (g14:_b[/g14]) (g15:_b[/g15]) ///
(g16:_b[/g16]) ///
(g17:-_b[/g11]-_b[/g12]-_b[/g13]-_b[/g14]-_b[/g15]-_b[/g16]) ///
(g22:_b[/g22]) (g23:_b[/g23]) (g24:_b[/g24]) (g25:_b[/g25]) (g26:_b[/g26]) ///
(g27:-_b[/g12]-_b[/g22]-_b[/g23]-_b[/g24]-_b[/g25]-_b[/g26]) ///
(g33:_b[/g33]) (g34:_b[/g34]) (g35:_b[/g35]) (g36:_b[/g36]) ///
(g37:-_b[/g13]-_b[/g23]-_b[/g33]-_b[/g34]-_b[/g35]-_b[/g36]) ///
(g44:_b[/g44]) (g45:_b[/g45]) (g46:_b[/g46]) ///
(g47:-_b[/g14]-_b[/g24]-_b[/g34]-_b[/g44]-_b[/g45]-_b[/g46]) ///
(g55:_b[/g55]) (g56:_b[/g56]) ///
(g57:-_b[/g15]-_b[/g25]-_b[/g35]-_b[/g45]-_b[/g55]-_b[/g56]) ///
(g66:_b[/g66]) ///
(g67:-_b[/g16]-_b[/g26]-_b[/g36]-_b[/g46]-_b[/g56]-_b[/g66]) ///
(g77:-(_b[/g11]-_b[/g12]-_b[/g13]-_b[/g14]-_b[/g15]-_b[/g16]) - ///
(_b[/g12]-_b[/g22]-_b[/g23]-_b[/g24]-_b[/g25]-_b[/g26]) - ///
(_b[/g13]-_b[/g23]-_b[/g33]-_b[/g34]-_b[/g35]-_b[/g36]) - ///
(_b[/g14]-_b[/g24]-_b[/g34]-_b[/g44]-_b[/g45]-_b[/g46]) - ///
(_b[/g15]-_b[/g25]-_b[/g35]-_b[/g45]-_b[/g55]-_b[/g56]) - ///
(_b[/g16]-_b[/g26]-_b[/g36]-_b[/g46]-_b[/g56]-_b[/g66]))