想在Stata 做svar,可老出现一下的一个错误，不知道为何，求助

quietly var INT INF lgov lreer lgdp, lags(1 2 3 4)
estimates save model
irf create model, set(svar) step(20)
matrix A = [1,0,0,0,0\.,1,0,0,0\.,.,1,0,0\.,.,.,1,0\.,.,.,.,1]
matrix B = [.,0,0,0,0\0,.,0,0,0\0,0,.,0,0\0,0,0,.,0\0,0,0,0,.]
matrix list A
matrix list B
svar INT INF lgov lreer lgdp, lags(1 2 3 4) aeq(A) beq(B)

unrecognized command:  mlopts