MEGAN5 license and command line

[doublealice]

Hello,

I recently installed MEGAN5 to my linux server to analyze my NGS data. I have some questions about the license and file input/output.

I got license file from email and saved it as "MEGAN5-academic-license.txt" under ~/megan. But I am not sure how I can active the license via option -L in command line. Below are commands I tried:

$ MEGAN -g -E -L ~/megan/MEGAN5-academic-license.txt

MEGAN fatal error:
java.awt.HeadlessException:
No X11 DISPLAY variable was set, but this program performed an operation which requires it.

No X11 DISPLAY variable was set, but this program performed an operation which requires it.

$xvfb-run --auto-servernum --server-num=1 MEGAN -g false -L ~/megan/MEGAN5-academic-license.txt

No output

Would you please help to correct the command? And, should I involve the license file every time I use MEGAN5 or it has a way to active only once?

Another question is, I have a 2G blastn output file which generated from a illumina sequencing. I tried to import it and get a rma file. But my command have no output after 26 hours running. I guess there must be something wrong with the command. Here are two files I used:

commands.txt
-----------------

load treeFile='/home/megan/class/resources/ncbi.map';
load treeFile='/home/megan/class/resources/ncbi.tre';
load taxGIFile='/home/megan/gi_taxid-March2015X.bin';
import blastfile='/home/blast/blast_map/blastn_veroall_tab7' fastaFile='/home/blast/blast_map/Veroall.fasta' meganfile='veroal.rma' blastFormat=BlastTAB;
quit;

job_megan
-------------

#!/bin/bash
#PBS -l nodes=1pn=12
#PBS -l mem=20gb
#PBS -l walltime=30:00:00
#PBS -m abe
#PBS -q default
#PBS -N megan
cd ${PBS_O_WORKDIR}
xvfb-run --auto-servernum --server-num=1 MEGAN -g false -v tree -L /home/megan/MEGAN5-academic-license.txt -c commands.txt

I use qsub system to submit the job, but no feedback.

Would you please help to correct it? I appreciate your help.