计算量表信度时，输出的结果中出现了warning，具体如下：

The determinant of the covariance matrix is zero or approximately zero. Statistics based on its inverse matrix cannot be computed and they are displayed as system missing values.

但还是输出了Cronbach's Alpha，请问这对结果有影响吗？是不是还是可以用这个信度值呢？