Hi there! I got a problem with mason for 454 read simulation. The command was: mason 454 -sq -mp E_tenella.fasta (Eimeria tenella genome) The error message: .... contig # 2148/4707 contig # 2149/4707 contig # 2150/4707 contig # 2151/4707 contig # 2152/4707 contig # 2153/4707 /home/mat/seqan/seqan-trunk/projects/library/seqan/sequence_journaled/journal_entries_sorted_array.h:394 Assertion failed : it->virtualPosition >= delta was: 216739043537519363 < 18230286505148746552 Aborted Any suggestions? Thanks! best, mat <ATT00001..txt>