做因子分析的时候，出现如下提示语，

There are fewer than two cases, at least one of the variables has zero variance, there is only one variable in the analysis, or correlation coefficients could not be computed for all pairs of variables. No further statistics will be computed.

后面因子分析无法继续，请问一下，这个问题是什么地方出了问题，该怎么办？具体的操作步骤是什么？谢谢。