Selling Land Parcels and Helper Scripts

I installed the NSL Money Server last Sunday night and the Money system is working well
However - I cannot sell Land
I wish at very least to be able to sell a parcel of land for 0$ to a specific person

My System is Ubuntu Server
I run Apache2 and have installed php-xmlrpc and php-curl with apt-get
My Version of php is 7

I installed the Helper scripts Below is the ls -l of the Dirs
root@ubuntuM:/home/web/html/currency# ls -l
total 36
drwxr-sr-x 2 80 80 4096 Jun 28 11:57 config
drwxr-sr-x 4 80 80 4096 Nov 30 2014 flotsam_XmlRpcGroup
drwxr-sr-x 3 80 80 4096 Jun 27 21:17 helper
drwxr-sr-x 6 80 80 4096 Nov 30 2014 images
drwxr-sr-x 2 80 80 4096 Jun 28 11:55 include
drwxr-sr-x 2 80 80 4096 Nov 30 2014 jbxl
drwxr-sr-x 6 80 80 4096 Nov 30 2014 opensim.helper
drwxr-sr-x 2 80 80 4096 Nov 30 2014 opensim.phplib
-rwxr-xr-x 1 80 80 287 Nov 30 2014 rm_symblink
root@ubuntuM:/home/web/html/currency#

root@ubuntuM:/home/web/html/currency/include# ls -l
total 0
lrwxrwxrwx 1 80 80 20 Nov 30 2014 config.php -> ../config/config.php
lrwxrwxrwx 1 80 80 18 Nov 30 2014 cron.php -> ../config/cron.php
lrwxrwxrwx 1 80 80 31 Nov 30 2014 env.mysql.php -> ../opensim.phplib/env.mysql.php
lrwxrwxrwx 1 80 80 27 Nov 30 2014 env_interface.php -> ../config/env_interface.php
lrwxrwxrwx 1 80 80 20 Nov 30 2014 index.html -> ../config/index.html
lrwxrwxrwx 1 80 80 22 Nov 30 2014 jbxl_tools.php -> ../jbxl/jbxl_tools.php
lrwxrwxrwx 1 80 80 32 Nov 30 2014 mysql.func.php -> ../opensim.phplib/mysql.func.php
lrwxrwxrwx 1 80 80 35 Nov 30 2014 opensim.mysql.php -> ../opensim.phplib/opensim.mysql.php
lrwxrwxrwx 1 80 80 22 Nov 30 2014 tools.func.php -> ../jbxl/tools.func.php
root@ubuntuM:/home/web/html/currency/include#

and my config.php ->

<?php
//
// Configration file for non Web Interface
//
//
//

// Please set this hepler script URL and directory
if (!defined('ENV_HELPER_URL')) define('ENV_HELPER_URL', 'http://thekaz.ddns.$
if (!defined('ENV_HELPER_PATH')) define('ENV_HELPER_PATH', '/home/web/html/curr$

///////////////////////////////////////////////////////////////////////////////$
// Valiables for OpenSim

// Please set MySQL DB access information
define('OPENSIM_DB_HOST', 'localhost');
define('OPENSIM_DB_NAME', 'opensim');
define('OPENSIM_DB_USER', 'opensimuser');
define('OPENSIM_DB_PASS', 'opensimpassword');
//
define('OPENSIM_DB_MYSQLI', true); // if you use MySQLi interface,$


// Money Server Access Key
// Please set same key with MoneyScriptAccessKey in MoneyServer.ini
define('CURRENCY_SCRIPT_KEY', '123456789');


// Group Module Access Keys
// Please set same keys with at [Groups] section in OpenSim.ini (case of Aurora$
define('XMLGROUP_RKEY', '1234'); // Read Key
define('XMLGROUP_WKEY', '1234'); // Write key

///////////////////////////////////////////////////////////////////////////////$
// You need not change the below usually.


I have checked the keys above and they are correct
In Robust.ini AND Robust.HG.ini I have sent the [GridInfoService] sections to show :
economy = http://thekaz.ddns.net/currency/helper/

I must be missing something here - When I try to buy land - I get an "Unable to Authenticate" or "Cannot Resolve Hostname" error in the Viewer
I have also gone through the the Other forum regarding this same error - but I done believe I have to edit php files?
Any help suggestions will be greatly appreciated

Thank you
Jony

Please check PHP log. And Apache, OpenSim and MoneyServer log too.

OK PROBLEM IS SOLVED
Thank you Iseki san for Pointing me in the right direction

Steps to resolve
1. Apache2 error logs showed this
root@ubuntuM:/var/log/apache2# cat error.log
[Thu Jun 30 06:25:03.212835 2016] [mpm_prefork:notice] [pid 7063] AH00163: Apache/2.4.18 (Ubuntu) configured -- resuming normal operations
[Thu Jun 30 06:25:03.212887 2016] [core:notice] [pid 7063] AH00094: Command line: '/usr/sbin/apache2'
[Thu Jun 30 20:51:58.869516 2016] [:error] [pid 23066] [client 36.2.113.124:59504] PHP Notice: Undefined variable: HTTP_RAW_POST_DATA in /home/web/html/currency/opensim.helper/currency.php on line 329
[Thu Jun 30 20:52:08.855210 2016] [:error] [pid 23300] [client 36.2.113.124:59517] script '/var/www/html/currency/helper/land.php' not found or unable to stat
[Thu Jun 30 20:53:08.400156 2016] [:error] [pid 23062] [client 36.2.113.124:59530] PHP Notice: Undefined variable: HTTP_RAW_POST_DATA in /home/web/html/currency/opensim.helper/currency.php on line 329
[Thu Jun 30 20:54:33.212466 2016] [:error] [pid 23064] [client 36.2.113.124:59564] PHP Notice: Undefined variable: HTTP_RAW_POST_DATA in /home/web/html/currency/opensim.helper/landtool.php on line 170
root@ubuntuM:/var/log/apache2#

2. Downloaded the missing land.php from GIT
https://github.com/roelmann/uswmoodle/tree/master/auth/mnet

3. Tried it again and the New Error came up
[Fri Jul 01 17:04:37.925886 2016] [:error] [pid 8117] [client 192.168.1.4:38310] PHP Notice: Undefined variable: HTTP_RAW_POST_DATA in /home/web/html/currency/opensim.helper/landtool.php on line 170

4. The solution to this was in the Stack
http://stackoverflow.com/questions/9553168/undefined-variable-http-raw-post-data
So - ahead of line 170 call I inserted this line
$HTTP_RAW_POST_DATA = file_get_contents('php://input');

And all works find I can now sell land and parcels

Thank you again Iseki-San!

Jony