problem in get_SNVs_per_pileup

Hi, 
I am using CaSpeR to analyse bulk RNA sequencing data. when I give the command BAFExtract/bin/BAFExtract -get_SNVs_per_pileup it shows an error 

"Calling SNVs with minimum 20 total and 4 alternate read coverage and 0.100 min alternate frequency.
Procesing 1
Could not open /home/azureuser/casper/01_pileupdir/1.bin for reading."

How do i proceed now? 

Thanks for the package. 