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The warning is to inform that SHAZAM found a missing value in the data. You can either skip the missing value using the command SET SKIPMISS or take an alternative action such as those described in Cohen and Cohen (1983) or Baraldi and Enders (2010).

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Corrected to answer the users question.

The warning related to O indicates that something has gone wrong in the generation of O. Suggest you print it out and take a look at the content. It would be helpful to see what is printed.

With regard to inform that the other warning (that SHAZAM found a missing value in the data. You can data), either skip the missing value using the command SET SKIPMISS or take an alternative action such as those described in Cohen and Cohen (1983) or Baraldi and Enders (2010).