r - ez attempt to attribute NULL -


i want conduct within-subj anova using ezanova function ez package code:

> ezanova(data = sht_mean_cond_molten, dv = "value",           within = "variable", wid = "id", detailed = true,           type = 2)  fehler in table(data[, names(data) %in% c(wid, within)]) :  versuch ein attribut von null zu setzen error message means "attempt set attribute on null"

what might problem?


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