在HLM软件里面运行数据。但是在运行“随机参数回归模式”的时候跑不出来数据（相应的后面的模式均跑不出来结果），显示为


There is a problem in the fixed portion of the model.  A near singularity is
likely.  Possible sources are a collinearity or multicollinearity among the
predictors.  We suggest that you examine a correlation matrix among the fixed
effect predictors.


我不太明白是什么原因，也不知道应该怎么修改数据。希望各位大师可以为我指导迷津，感激不尽！