A question about Smoothing methods in SAS

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I was trying to compare the perfomance of different smoothing methods in the time series forecasting system (TSFS). However, I could not select the Seasonal soothing, Winter method-additive, and Winter method-multiplicative for the series I was investigating. These three methods were all grey out, I could only select the other methods.

When I tried fit models from list, I got the following notice: "error: model fitting failed. this model is not allowed for this series."

I knew that all the observations in the series should be strictly positive if I want to fit a seasonal smoothing model, and they are all positive. Anyone know what the problem is.

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关键词：smoothing question Methods Method smooth

waiting for answer!

I solve the problem by myself finally, let share with you.
For seasonal data, the date variable should contain NO gaps. That is, when you get some data from the internet, it always provides those available data with the corresponding date value. For instance, the available data provided in stock market is only in week day, and you want to perform smoothing method on daily basis, then you have to add those date value covering the weekends with a corresponding reasonable stock price before using TSFS.

You've already solved your problem.
By the way why don't you use Eviews to deal with time series data ?  
I guess Eviews is one of the best specialized program to deal with time series data.