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I have installed all dependencies as specified still I am getting empty results file after running the query. What is the probable cause of this issue.

Hi,
I am trying to build spraqlgx using docker and when I run docker build -t sparqlgx . I get:

[ERROR] The compilation of cppo failed at "jbuilder build -p cppo -j 4".
[ERROR] The compilation of easy-format failed at "jbuilder build -p easy-format
-j 4".
[menhir: make Makefile] Command started
∗ installed menhir.20171206

#=== ERROR while installing cppo.1.6.0 ========================================#
opam-version 1.2.2
os linux
command jbuilder build -p cppo -j 4
path /opt/sparqlgx/.opam/system/build/cppo.1.6.0
compiler system (4.02.3)
exit-code 127
env-file /opt/sparqlgx/.opam/system/build/cppo.1.6.0/cppo-441-50de41.env
stdout-file /opt/sparqlgx/.opam/system/build/cppo.1.6.0/cppo-441-50de41.out
stderr-file /opt/sparqlgx/.opam/system/build/cppo.1.6.0/cppo-441-50de41.err

#=== ERROR while installing easy-format.1.3.0 =================================#
opam-version 1.2.2
os linux
command jbuilder build -p easy-format -j 4
path /opt/sparqlgx/.opam/system/build/easy-format.1.3.0
compiler system (4.02.3)
exit-code 127
env-file /opt/sparqlgx/.opam/system/build/easy-format.1.3.0/easy-format-441-982793.env
stdout-file /opt/sparqlgx/.opam/system/build/easy-format.1.3.0/easy-format-441-982793.out
stderr-file /opt/sparqlgx/.opam/system/build/easy-format.1.3.0/easy-format-441-982793.err

=-=- Error report -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
The following actions were aborted
∗ install biniou 1.2.0
∗ install yojson 1.4.0
The following actions failed
∗ install cppo 1.6.0
∗ install easy-format 1.3.0
The following changes have been performed
∗ install base-bytes base
∗ install base-ocamlbuild base
∗ install conf-m4 1
∗ install conf-which 1
∗ install jbuilder 1.0+beta16
∗ install menhir 20171206
∗ install ocamlbuild 0
∗ install ocamlfind 1.7.3

The former state can be restored with:
opam switch import "~/.opam/system/backup/state-20171111150701.export"
The command '/bin/sh -c opam init -a && echo ". /opt/sparqlgx/.opam/opam-init/init.sh > /dev/null 2> /dev/null || true" > ~/.bashrc && opam install -y menhir yojson' returned a non-zero code: 4

Any ideas?
Thanks!

I am trying to run a SPARQLGX

but stuck in one step. when I tried to query a loaded dataset. it gives the attached error. Will, you plz help in this regard. Your help will be greatly appreciated.