AMOS 做结构方程模型遇到以下问题

求助，用AMOS做模型，遇到以下问题：
An error occurred while attempting to fit the model.
  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 data 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 data 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.
已经检验过了数据没有缺失值，样本330个。
该如何解决这一问题呢？请大神相助！谢谢！

这是模型图