help about cufflinks for bacterial rna-seq data

[qqtwee]

Hi,recently I am analysing bacterial rna-seq data from illumina GAII.Iwant to use cufflinks to caculate RPKM, I select the default options and get the result file as follow:
tracking_id class_code nearest_ref_id gene_id gene_short_name tss_id locus length coverage FPKM FPKM_conf_lo FPKM_conf_hi FPKM_status
That is all inthe final file. There is no values. I don't know why.
So please help me if you know the reason. Is there any special options in cufflinks for analysing bacterial rna-seq data?
Thank you very much!
Best wishes!