[MUMmer-help] error message

[astrid b. <ast...@un...>]

Hi
I am trying to run mummer to compare very similar genome assemblies (two 
individuals of the same species)
and get back the following error.
I reduced the query and reference sequence size I used to match the 
character limitations.
1: PREPARING DATA
2,3: RUNNING mummer AND CREATING CLUSTERS
# reading input file "ref_qry.ntref" of length 497187885
# construct suffix tree for sequence of length 497187885
# (maximum reference length is 536870908)
# (maximum query length is 4294967295)
# process 4971878 characters per dot
#............................................................................ERROR: 
mummer and/or mgaps returned non-zero

Any suggestions on what is happening?
My guess is that this is a memory issue.
Is it possible to run Mummer multi-threaded?
Thank you very much in advance
All the best
Astrid Böhne

-- 
Astrid Böhne
Universität Basel
Zoologisches Institut
Evolutionsbiologie
Vesalgasse 1
CH-4051 Basel
Switzerland
Phone +41 (0)61 267 03 05
Fax +41 (0) 61 267 03 01