更换估计方法或者估计软件。也可以参看以下论文:
Yuan, K.-H., Wu, R.L., & Bentler, P. M. (2011). Ridge structural equation modeling with correlation matrices for ordinal and continuous data. British Journal of Mathematical and Statistical Psychology, 64, 107-133.
Yuan, K.-H., & Chan, W. (2008). Structural equation modeling with near singular covariance matrices. Computational Statistics and Data Analysis, 52, 4842-4858.