[R] Error when trying to run model selection with leaps package

[bitzy]

I am trying to do an exhaustive model search and am having some sort of input
error. 

leaps ( x= At[,3:8], y = At [,2],method="Cp")

Error in `colnames<-`(`*tmp*`, value = "1") : 
  attempt to set colnames on object with less than two dimensions

- where At is my data matrix

Any suggestions on what this error might mean? Or suggestions on alternative
methods for performing exhaustive model searches?

Thanks

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