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I have some issues with the function grouped_ggbetweenstats from ggstatsplot package. I have tried with different data, but I always obtain the same error:

Error in unique.default(x, nmax = nmax) : 
  unique() puede ser aplicada solamente a vectores

I provide an example here:

lapply(c("rstatix", "ggstatsplot", "openintro"), require, character.only = TRUE)
print(hsb2)
grouped_ggbetweenstats(data = hsb2, x=prog, y= math, grouping.var = gender, results.subtitle=F, messages=F, var.equal=T, p.adjust.method="holm")

Please, could anyone provide any idea about what the error is and a possible solution?

Thanks in advance

DanielCG
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