关于stata做svar出现的错误的求助

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我想用stata做SVAR，出来一下错误提示，请问各位大神这rank是什么意思啊？我该如何解决？
indentification需要12个constraints我就是给了12个，可是这个rank要怎么弄呢？
我的命令是
matrix A = (1,.,0\.,1,0\.,0,1)
matrix B = (.,0,0\0,.,0\0,0,.)
svar dlreal em lele, aeq(A) beq(B) lags(1/11) var
错误提示是：
With the current starting values, the constraints are not sufficient for identification
The constraints placed on A and B are
  1999:  [a_1_1]_cons = 1
  1998:  [a_1_3]_cons = 0
  1997:  [a_2_2]_cons = 1
  1996:  [a_2_3]_cons = 0
  1995:  [a_3_2]_cons = 0
  1994:  [a_3_3]_cons = 1
  1993:  [b_1_2]_cons = 0
  1992:  [b_1_3]_cons = 0
  1991:  [b_2_1]_cons = 0
  1990:  [b_2_3]_cons = 0
  1989:  [b_3_1]_cons = 0
  1988:  [b_3_2]_cons = 0
These constraints place 12 independent constraints on A and B
The order condition requires at least 12 constraints.
Identification requires a rank of 18, but the identification matrix only has rank 17

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关键词：Stata tata SVAR SVA VaR sufficient starting current matrix placed