Start sikuli java process failed

Hi,

I have setup the robot framework in my windows 64 bit machine .
SikuliLibrary i have installed using pip. referred (https://github.com/rainmanwy/robotframework-SikuliLibrary )
I was able to execute the script using robot but sometimes i will get the below error and i will stuck trying and failed to fix this.

###############################################################################
D:\Software\Sikuli_Robot\ROBOTSW\ROBOTSW\Calc_SikuliSample_n\Calc_SikuliSample>robot.bat firstskuli.txt
[ ERROR ] Error in file 'D:\Software\Sikuli_Robot\ROBOTSW\ROBOTSW\Calc_SikuliSam
ple_n\Calc_SikuliSample\firstskuli.txt': Initializing test library 'SikuliLibrar
y' with no arguments failed: Start sikuli java process failed!
Traceback (most recent call last):
  File "C:\Python27\lib\site-packages\SikuliLibrary\sikuli.py", line 40, in __init__ self._start_sikuli_java_process()
  File "C:\Python27\lib\site-packages\SikuliLibrary\sikuli.py", line 97, in _start_sikuli_java_process self._wait_process_started()
  File "C:\Python27\lib\site-packages\SikuliLibrary\sikuli.py", line 114, in _wait_process_started
    raise RuntimeError('Start sikuli java process failed!')
==============================================================================
Firstskuli
==============================================================================
Windows Calculator Operations | FAIL |
Setup failed:
No keyword with name 'Add Image Path' found.

Also teardown failed:
No keyword with name 'Stop Remote Server' found.
------------------------------------------------------------------------------
Firstskuli | FAIL |
1 critical test, 0 passed, 1 failed
1 test total, 0 passed, 1 failed
==============================================================================
Output: D:\Software\Sikuli_Robot\ROBOTSW\ROBOTSW\Calc_SikuliSample_n\Calc_Sikul
iSample\output.xml
Log: D:\Software\Sikuli_Robot\ROBOTSW\ROBOTSW\Calc_SikuliSample_n\Calc_Sikul
iSample\log.html
Report: D:\Software\Sikuli_Robot\ROBOTSW\ROBOTSW\Calc_SikuliSample_n\Calc_Sikul
iSample\report.html

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In most of the time during execution of testcases this king of error i have seen.
Can you please suggest how to resolve this error.

Thank you.

Regards,
Krishna.