我在做满意度的结构方程模型，在运行的时候，提示我模型不能识别，是以下说法：The model is probably unidentified. In order to achieve identifiability,it will probably be necessary to impose 2 additional constraints.求哪个大牛能帮着指导下，我的问卷自由度是112，以下是变量的详细情况。以前没接触过这个软件，做了好多天了，实在是想不出来问题所在，求教~~~~

Number of variables in your model:	41
Number of observed variables:	17
Number of unobserved variables:	24
Number of exogenous variables:	21
Number of endogenous variables:	20