@ 2021-03-26 14:41:23: Read the chain file:  /sonas-hs/vakoc/hpc/data/oeldemer/hg19ToHg38.over.chain.gz
@ 2021-03-26 14:41:24: Liftover bigwig file: ./H3K27me123Tracks/GSM3734216_U2OS_WT_2.hg19.bw ==> ./H3K27me123Tracks/GSM3734216_U2OS_WT_2.hg19_hg38.bgr
Traceback (most recent call last):
  File "/root/.local/bin/CrossMap.py", line 234, in <module>
    crossmap_wig_file(mapTree, in_file, out_file, targetChromSizes, in_format = 'bigwig')
  File "/root/.local/lib/python3.6/site-packages/cmmodule/mapwig.py", line 86, in crossmap_wig_file
    for chrom, start, end, score in bigwigReader(in_file):
  File "/root/.local/lib/python3.6/site-packages/cmmodule/utils.py", line 164, in bigwigReader
    for i_st, i_end, i_score in bw.intervals(chr_name, 0, chr_size):
TypeError: 'NoneType' object is not iterable
[bwClose] There was an error while finishing writing a bigWig file! The output is likely truncated.