在AMOS中如何使用 Bootstrap进行多重中介检验呢？设置 Bootstrap后出现以下错误提

在AMOS中如何使用 Bootstrap进行多重中介检验呢？设置 Bootstrap后出现以下错误提示，是咋回事呢？An error occurred while attempting to fit the model during the analysis of a bootstrap sample , an attempt was made to compute the correlation between two variables one of whose estimated ariances failed to be positive . This attempt was made because standardized estimates in the analysis Properties window was checked or because the standardized method was used , or because a user-defined estimand requires calculating andardized estimates