Connection refused error.

Hi ,

I have installed robotframework(3.0) and sikulilibrary in a linux server. I, when i run a robot script it throws following error

bash# jybot nex_passivea.txt
==============================================================================
Nex Passive :: Sikuli Library Demo
==============================================================================
launch NEX application | FAIL |
Connection to remote server broken: [Errno 111] Connection refused
------------------------------------------------------------------------------
Nex Passive :: Sikuli Library Demo | FAIL |
1 critical test, 0 passed, 1 failed
1 test total, 0 passed, 1 failed
==============================================================================
Output: /tmp/robot_scripts/output.xml
Log: /tmp/robot_scripts/log.html
Report: /tmp/robot_scripts/report.html

the same setup Robotframework(3.0) and SikuliLibrary is working in another Linux server.

Here is my script:

*** Settings ***
Documentation Sikuli Library Demo
Test Setup Add Needed Image Path
Library SikuliLibrary

*** Variables ***

*** Test Cases ***
launch NEX application
    launch VNC
    Start citrix client
    launch application
    Exit NEX

*** Keywords ***
Add Needed Image Path
    Add Image Path /tmp/robot_scripts/img/

launch VNC
    Wait Until Screen Contain login.png 60
    Input Text login.png ep1
    click login_ok.png
    Wait Until Screen Contain ep1_verify.png 30
    Input Text login.png spd20st2
    Sleep 2s
    Click login_ok.png
    Wait Until Screen Contain cex_citrix_farm.png 60

Start citrix client
    ${passed}= Run keyword and return status screen should contain opload.png
    Sleep 5s
    Run keyword if ${passed} double click opload.png
    Sleep 5s

launch application
    Input Text username.png nex2au1
    Sleep 2s
    click in password.png password1.png
    Input Text pass.png AFhl2016!
    Sleep 2s
    Click ok
    Wait Until Screen Contain nex_header.png 180

Exit NEX
    :FOR ${index} IN RANGE 700
    \ Click nex_header.png
    \ Sleep 120s
    Sleep 3s
    Click nex_header.png
    Click network.png
    Sleep 2s
    Click nex_exit.png

Documentation:

here is the output from log.html file

Start / End / Elapsed: 20160906 09:59:36.941 / 20160906 09:59:37.248 / 00:00:00.307
09:59:36.944 TRACE Arguments: [ 'login.png' | '60' ]
09:59:37.245 FAIL Connection to remote server broken: [Errno 111] Connection refused
09:59:37.247 DEBUG Traceback (most recent call last): File "/usr/jython/Lib/site-packages/SikuliLibrary/sikuli.py", line 167, in run_keyword return self.remote.run_keyword(name, arguments, kwargs) File "/usr/jython/Lib/site-packages/robotframework-3.0-py2.7.egg/robot/libraries/Remote.py", line 90, in run_keyword result = RemoteResult(self._client.run_keyword(name, args, kwargs)) File "/usr/jython/Lib/site-packages/robotframework-3.0-py2.7.egg/robot/libraries/Remote.py", line 227, in run_keyword raise RuntimeError(message)
09:59:36.924 TRACE Arguments: [ ]

Regards,
Raghu