df error for 2 way repeated measures anova (simple query)


Ive done a 2 way repeated measures with one within subjects variable (Within) and one between subjects variable (Between) each with 2 levels using SPSS. The output gives me values for df Error(Within) and Error for Between and they are the same but does not give Error(Within*Between).

May I assume that this error is the same as for the other two? Could someone explain how this figure is arrived at please?