[datatable-help] Error with Tukey Test

[mrg2]

I'm trying to run a Tukey Test but it keeps saying that my class is none and
my mode is numeric. I've tried changing my variables into factors as other
posts have suggested, but it is still not working. Any help is much
appreciated. 

dol1351_groupsize_1yr <- read.csv("1351_Group_Size_1yr.csv")
anov1yr <-
aov(dol1351_groupsize_1yr$Number~as.factor(dol1351_groupsize_1yr$Time))
tuk1yr <- TukeyHSD(anov1yr)
summary(anov1yr)
summary(tuk1yr)





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