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I keep getting error messages:' The levels of the repeated effect are not different for each observation within a repeated subject.' Can anyone offer me some advice whether I can perform Mixed Effect Model in SPSS with my data or I have organised my data correctly? I have two groups of...

I keep getting error messages:' The levels of the repeated effect are not different for each observation within a repeated subject.' when performing Mixed effect model in SPSS. I have two groups of participants X and Y who performed two sets of tasks i.e. A and B. Group 1 has 12 subjects...