RPKM with easyRNASeq

Seems there is a bug in the RPKM function in easyRNASeq. Trying to generate RPKM values from counts results in the matrix with "NA".

The solution from seqanswers works :
http://seqanswers.com/forums/showthread.php?t=29909

It works for the other version of the package too.