求助！关于Amoss结构方程模型构建

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我在运行Amoss的时候出现了以下警告信息：
An error occurred while checking for missing date in the group,Group number 1.
The sample moment matrix is not positive definite.It could fail to be positive definite for any of the following reasons:
1.The sample covariance matrix or the sample correlation matrix contains a date entry error.
2.The observed variables are linearly dependent(perhaps because the sample size is too small).
3.The sample covariance matrix or sample correlation matrix was computed from incomplete date using the method of'pairwise deletion'.
4.The sample correlation matrix contains correlation coefficients other than product moment correlations(such as tetrachoric correlations).
For maximum likelihood estimation only,it may be appropriate to check"Allow non-positive definite sample covariance matrices" in the "Analysis Properties"window,or to use the Nonpositive method.

请各位指点！谢谢！！

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关键词：结构方程模型 amoss 模型构建 结构方程 Moss 方程 模型 结构 构建 amoss