installation open baraza sous linux redhat 5

Bonjours à tous! je suis heureux de pouvoir enfin discuter avec vous. actuellement je tente d'installer open baraza sur Linux redhat entreprise 5 via un serveur à distance. j'ai pu télécharger tous les fichiers nécessaire à l'installation de mon application. voici le README de l'application:

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Features
	Human Resource Management
		- Departmental definations
		- Job role definations
		- Full Employee profile with automated CV Generation
		- Job application and Evaluation
		- Internship and Casuals Management
		- Leave management
	Payroll
		- Allowances, Deductions and Taxes calculations
		- Payslip generation
		- Customisable payroll management
	Project Management
		- Project defination
		- Phase and task defination and allocation
		- Budget estimation
		- Expenditure management
 
Setup
 
1. install Postgresql <a href="http://www.postgresql.org/" target="_blank">http://www.postgresql.org/</a> version 8.3 and above
	Linux Installation
	- yum install postgresql-server
	- service postgresql initdb - (Optional - wull clear all databases)
	- service postgresql start
 
	Windows Installation
	- Download the setup file and install
 
	{ To make the installation easier you can set the password for user postgres durting the installation to Baraza2011 }
	{ Remember to change it for a live deployment }
 
2. install Java <a href="http://www.oracle.com/technetwork/java/javase/downloads/index.html" target="_blank">http://www.oracle.com/technetwork/ja...ads/index.html</a> version 1.6.18 and above
 
3. Download hr.app.1.2.4.zip and unzip it on any folder
	Edit the file ./hr.app/projects/config.xml to change the progres username {{dbusername}} and password {{dbpassword}}
 
4. Run the IDE
	cd ./hr.app/
	Linux : sh ide.sh
	Windows : double click on ide.bat in app folder
 
5. click on Human resources
   click Edit
 
6. Click on New Setup -> Save {Wait as the database builds}
	or Demo Setup -> Save {For Database Demo }
 
7. Running the appplication
	Linux : sh baraza.sh
	Windows : baraza.bar
 
USER PASSWORDS
username root
password enter
 
DEMO Accounts
Applicants
<a href="mailto:amteja@mteja.me.ke">amteja@mteja.me.ke</a> - enter
<a href="mailto:joseph.kamau@gmail.com">joseph.kamau@gmail.com</a> - enter
 
Employees
jdoe - enter
jtinga - enter

lorsque je tente de lancer sh ide.sh je reçois le message suivant:

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Exception in thread "main"java.awt.HeadlessException:
No X11 DISPLAY variable was set, but this program performed operation which requires it.
      at java.applet.Applet.<init>(Applet.java:67)
      at java.swing.Japplet.<init>(JApplet.java:130)
      at org.baraza.Baraza.<init>(Baraza.java:26)
      at org.baraza.Baraza.main(Baraza.java:56)

j'ai énormément besoin de votre aide.
Merci.