#Classify_bin_BLASTN Segmentation fault

[AVIK9875]

metawrap classify_bins -b /home/rmvcc/INITIAL_BINNING/BIN_REASSEMBLY/reassembled_bins/ -o bin_classify
metawrap classify_bins -b /home/rmvcc/INITIAL_BINNING/BIN_REASSEMBLY/reassembled_bins/ -o bin_classify

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ALIGN CONTIGS TO DATABASE WITH MEGABLAST

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----- setting up ouput folder bin_classify and merging contigs from all bins... -----

Warning: bin_classify already exists.

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----- aligning bin_classify/all_contigs.fa to /media/rmvcc/Vivekananda/NCBI_nt/ncbi_nt_db -----
----- database with MEGABLAST. This is the longest step - please be patient. You may look at the -----
----- classification progress in bin_classify/megablast_out.raw.tab -----

/home/rmvcc/miniconda3/envs/metawrap-py27/bin/metawrap-modules/classify_bins.sh: line 126: 3444798 Segmentation fault (core dumped) blastn -task megablast -num_threads $threads -db ${BLASTDB}/nt -outfmt '6 qseqid qstart qend qlen sseqid staxids sstart send bitscore evalue nident length' -query ${out}/all_contigs.fa > ${out}/megablast_out.raw.tab

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***** Failed to run megablast. Exiting... *****

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real 844m59.282s
user 599m56.630s
sys 17m36.518s

Even i try to run separately:
blastn -task megablast -num_threads 5 -db /media/rmvcc/Vivekananda/NCBI_nt/ncbi_nt_db/nt -outfmt 6 -query /media/rmvcc/Vivekananda/NCBI_nt/all_contigs.fa > output.tab
Segmentation fault (core dumped)

my system have 40 core 80 threads and 256 gb memory. Please help me.