.warning:ttest: encountered 601 cases where var1 and/or var2 were less than or equal to 0. Output set to missing values in these cases

Hello

I am getting the warning as shown below. Is it a serious problem?
warning:ttest: encountered 601 cases where var1 and/or var2 were less than
or equal to 0. Output set to missing values in these cases

Thanks in advance

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Received on Fri Sep 04 2009 - 03:46:58 MDT