TypeError: Expected bytes, got int

[pykey]

Dear all,

I just post my error stack here:

for r in st.fetch(chro, start, end):
  File "pysam/calignmentfile.pyx", line 897, in pysam.calignmentfile.AlignmentFile.fetch (pysam/calignmentfile.c:11463)
  File "pysam/calignmentfile.pyx", line 816, in pysam.calignmentfile.AlignmentFile.parse_region (pysam/calignmentfile.c:10830)
  File "pysam/calignmentfile.pyx", line 1650, in pysam.calignmentfile.AlignmentFile.gettid (pysam/calignmentfile.c:18701)
  File "pysam/calignmentfile.pyx", line 669, in pysam.calignmentfile.AlignmentFile.get_tid (pysam/calignmentfile.c:9274)
  File "pysam/cutils.pyx", line 114, in pysam.cutils.force_bytes (pysam/cutils.c:2661)
TypeError: Expected bytes, got int

chro, start, and end are all integers.

Any idea?
Thanks,

[Florian Finkernagel]

Dear pykey,

'chro' must be a byte-string - it's a reference name.

So long,

Florian