covert gtf to bed12

I am working with Galaxy eu and i get an error of message when ucsing the conver tool GTF to BED12. i am sure the input file is a GTF (D. melanogaster dm6 from UCSC), so I cannot understand the source of the problem…

Can anyone suggest?
Thanks
Alex

What is your error message? Can you please sent an error report with the bug button?

Thanks,
Bjoern

Dear Bjoern, I think i submitted the report, however below are some detailed:

Error Details

Execution resulted in the following messages:

Fatal error: Exit code 255 ()

Tool generated the following standard error:

invalid gffGroup detected on line: chrUn_CP007120v1 dm6_refGene exon 46106 46174 0.000000 + . gene_id “NR_156799”; transcript_id “NR_156799”; GFF/GTF group NR_156799 on chrX+, this line is on chrUn_CP007120v1+, all group members must be on same seq and strand

Thanks
Alessandro