大家好，我用AMOS构建结构方程模型，结果无法识别，我的模型和output的结果如下面所示，求好心人帮忙

下面是output的输出结果：

Notes for Model (Default model)
Computation of degrees of freedom (Default model)

Number of distinct sample moments:	54
Number of distinct parameters to be estimated:	34
Degrees of freedom (54 - 34):	20

Result (Default model)
The model is probably unidentified. In order to achieve identifiability, it will probably be necessary to impose 4 additional constraints.