Index
@pg ID:alfalfa VN:0.8.1
parsing options: ...
parsing options: done
loading ref sequences: ...
name: gi|9626243|ref|NC_001416.1|
comment: Enterobacteria phage lambda, complete genome
loading ref sequences: done

ref sequence: reference.fasta

building index with s = 12 ...

suffixsort()

DONE suffixsort()

size concatenated sequence = 48516
number of suffix array values = 4043
number of lcp values >= 255: 0
building index: done
saving index to disk ...
saving index to disk: done
time for building index structure: 0.05
INDEX SIZE IN BYTES: 8474364

It's normal，but when I use align
@pg ID:alfalfa VN:0.8.1
parsing options: ...
parsing options: done
atempting to load index 454reads ...
index loaded succesful
Mapping unpaired reads to the index using 1 threads ...
Segmentation fault
who can solve this problem?,Thank you very much