I am using R 3.6 RStudio: 1.2.1335, Windows: 7

Hi I am trying the tutorial of WGCNA using the tutorial data and the tutorial

WGCNATUTORIAL

All the steps working well and I understand the concept except the last few

traitColors = numbers2colors(datTraits, signed = FALSE)'

when I am doing this step I am getting error of

*Error in numbers2colors(datTraits, signed = FALSE) : 
  'x' must be numeric. For a factor, please use as.numeric(x) in the call*

If I do 'head(datTraits)

I understand that it is asking a numeric data which is not there if I select a single column e.g datTraits$totalFat it will work well but how I bring all the column together as shown in that tutorial?

please help