squid running errors

[cauyrd]

Hello, when I analyze my BWA mapped BAM files, I got the following error:

squid: src/SegmentGraph.cpp:2489: void SegmentGraph_t::CompressNode(): Assertion `LinkedNode.s ize()!=0' failed. /var/spool/torque/mom_priv/jobs/10249993.mesabim3.msi.umn.edu.SC: line 9: 6359 Aborted (core dumped) squid -b lncap.sv_build.bam -o lncap_squid --bwa

The stand output is below: Reference name 1 --> 0 Reference name 10 --> 9 Reference name 11 --> 10 Reference name 12 --> 11 Reference name 13 --> 12 Reference name 14 --> 13 Reference name 15 --> 14 Reference name 16 --> 15 Reference name 17 --> 16 Reference name 18 --> 17 Reference name 19 --> 18 Reference name 2 --> 1 Reference name 20 --> 19 Reference name 21 --> 20 Reference name 22 --> 21 Reference name 3 --> 2 Reference name 4 --> 3 Reference name 5 --> 4 Reference name 6 --> 5 Reference name 7 --> 6 Reference name 8 --> 7 Reference name 9 --> 8 Reference name MT --> 24 Reference name X --> 22 Reference name Y --> 23 [Fri Jan 4 10:03:53 2019] Starting reading bam file. [Fri Jan 4 11:18:49 2019] Building nodes, finish seeding. [Fri Jan 4 11:18:51 2019] Building nodes, finish expanding to whole genome. [Fri Jan 4 11:18:57 2019] Finish calculating reads per node. [Fri Jan 4 11:18:57 2019] Starting building edges. [Fri Jan 4 11:33:39 2019] Finish raw edges. [Fri Jan 4 11:33:39 2019] Finish filtering edges from multi-aligned reads. [Fri Jan 4 11:33:39 2019] Finish adding partial aligned reads. [Fri Jan 4 11:33:39 2019] Finish building edges. Error: 0 nodes are connected by edges.

What is the reason to get such error? memory issue? I run squid with 12 cores and 30gb total memory. My BAM file is 7.5gb. My command is: squid -b lncap.sv_build.bam -o lncap_squid --bwa