请教MLwiN相关

拟合模型时，跳出一个对话框（如下），请哪位高手支支招应该怎么解决，是出了什么问题呢。感激不尽！
另外可否附送一下如何从MLwiN中将数据导出，谢谢啦~


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Numeric warning
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IGLS/RIGLS NUMERIC WARNING.

SSP matrix for fixed part has gone negative definite - a reconstruction to the nearest non-negative form has been used.Numeric warnings can be suppressed by setting an option on the Estimation Control,IGLS/RIGLS panel.A discussion on the possible causes of numeric problems can be found under the upic Numeric Problems in the help system.

CONTINUE ESTIMATION ?
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是(Y)   否(N)   
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遇到相同的问题，求解答，O(∩_∩)O谢谢！