[R] Tukey HSD not working

[PGZC]

 TukeyHSD(fit)
Error in UseMethod("TukeyHSD") : 
  no applicable method for 'TukeyHSD' applied to an object of class "lm"
> TukeyHSD(anova)
Error in UseMethod("TukeyHSD") : 
  no applicable method for 'TukeyHSD' applied to an object of class
"function"
> TukeyHSD(group)
Error in UseMethod("TukeyHSD") : 
  no applicable method for 'TukeyHSD' applied to an object of class
"c('integer', 'numeric')"
> TukeyHSD(y)
Error in UseMethod("TukeyHSD") : 
  no applicable method for 'TukeyHSD' applied to an object of class
"c('double', 'numeric')"
> TukeyHSD(data)
Error in UseMethod("TukeyHSD") : 
  no applicable method for 'TukeyHSD' applied to an object of class
"data.frame"
> TukeyHSD(summary)
Error in UseMethod("TukeyHSD") : 
  no applicable method for 'TukeyHSD' applied to an object of class
"function"
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