Hi, i'm trying to get the normalized counts only, for all the replicates and genes of my data (named "14vs48)". 

I'm trying this command:

table_counts <- counts(results14vs48, normalized=TRUE)

but i get this error message:

unable to find an inherited method for function ‘counts’ for signature ‘"DESeqResults"’

I havent found a similar question on the internet. Why is this happening?

You need to call counts() on your DESeqDataSet object. This is the object that stores your count data.

You are currently calling counts() and the object you received from calling results(...) on your DESeqDataSet object. This results object merely holdes the statistics for a particular contrast of interest from your dataset.