How do I get description in BLAST?

Hi, all.

I’m trying to get a description to the gene list using BLAST.
I created the original database with the following command and did BLAST, but my output shows a lot of N/A.

$ makeblastdb 
-in caenorhabditis_elegans.PRJNA13758.WBPS16.protein.fa 
-out elegansdb 
-dbtype prot 
-parse_seqids


$ blastx 
-query genes.fasta 
-db /home/nkarim/blast/db/elegansdb 
-outfmt "6 qseqid salltitles sseqid sscinames scomnames staxid pident length mismatch gapopen qstart qend sstart send ppos evalue bitscore" 
-evalue 1e-3 
-out results

I have tried all the commonly suggested solutions.

1) Download taxdb.tar.gz in the same directory as the database, and unzip it.

$ update_blastdb.pl taxdb
$ tar -xvf taxdb.tar.gz

2) Add export BLASTDB=$BLASTDB:/home/nkarim/blast/db to ~/.bashrc and reload.

Are there any other problems for me?
I’m facing this problem for few days but can’t solve it.

I really appreciate for your help in advance!