Use of uninitialized value in concatenation (.) or string at /home/wangzt/software/ppsPCP/bin/../src/get_the_pav_seq.pl line 33, <LI> line 6170.

[Wang001-hash]

Oh！ Why?

[Zhuxitong]

Probably because a higher version of bedtools was used during the run. Version 2.25.0 should avoid this problem, as well as another one where only Ns were added in the final FA file.