Error in 5.4 example

Example 5.4 runs DEAnalysis without replicates but it is not working. Error:

DE_EDGER :: 16:05:01 [03-09-2015] Starting Differential Expression Analysis of /Users/rnuneztorres/Documents/Bioinformatica/CBBIO/miarma/Examples/basic_examples/miRNAs/Known_miRNAs/results/Readcount_results/nat_bw1-ReadCount.tab with EdgeR Problem while running this R command: print(resultsfiles)

Error: print(resultsfiles) : objeto 'resultsfiles' no encontrado Ejecución interrumpida