[Users] broblem when starting petals

[devil_head]

hello, I'm a beginner with petals studio , my problem is tha when i start petals studio an error message appears 
this is the log file :



Code:
a!SESSION 2010-02-10 21:46:23.546 -----------------------------------------------
eclipse.buildId=unknown
java.version=1.4.2_06
java.vendor=Sun Microsystems Inc.
BootLoader constants: OS=win32, ARCH=x86, WS=win32, NL=fr_FR
Command-line arguments:  -os win32 -ws win32 -arch x86

!ENTRY com.ebmwebsourcing.petals.tools.eclipse.su.main 4 0 2010-02-10 21:46:27.437
!MESSAGE 
!STACK 0
org.osgi.framework.BundleException: The bundle could not be resolved. Reason: Missing Constraint: Bundle-RequiredExecutionEnvironment: J2SE-1.5
	at org.eclipse.osgi.framework.internal.core.AbstractBundle.getResolverError(AbstractBundle.java:1313)
	at org.eclipse.osgi.framework.internal.core.AbstractBundle.getResolutionFailureException(AbstractBundle.java:1297)
	at org.eclipse.osgi.framework.internal.core.BundleHost.startWorker(BundleHost.java:309)
	at org.eclipse.osgi.framework.internal.core.AbstractBundle.resume(AbstractBundle.java:370)
	at org.eclipse.osgi.framework.internal.core.Framework.resumeBundle(Framework.java:1068)
	at org.eclipse.osgi.framework.internal.core.StartLevelManager.resumeBundles(StartLevelManager.java:557)
	at org.eclipse.osgi.framework.internal.core.StartLevelManager.incFWSL(StartLevelManager.java:464)
	at org.eclipse.osgi.framework.internal.core.StartLevelManager.doSetStartLevel(StartLevelManager.java:248)
	at org.eclipse.osgi.framework.internal.core.StartLevelManager.dispatchEvent(StartLevelManager.java:445)
	at org.eclipse.osgi.framework.eventmgr.EventManager.dispatchEvent(EventManager.java:227)
	at org.eclipse.osgi.framework.eventmgr.EventManager$EventThread.run(EventManager.java:337)

!ENTRY org.eclipse.osgi 4 0 2010-02-10 21:46:27.453
!MESSAGE Bundle initial at reference:file:plugins/com.ebmwebsourcing.petals.tools.eclipse.su.main_1.3.1.200912041646.jar/ was not resolved.

!ENTRY org.eclipse.osgi 4 0 2010-02-10 21:46:27.468
!MESSAGE Application error
!STACK 1
java.lang.IllegalStateException: Unable to acquire application service. Ensure that the org.eclipse.core.runtime bundle is resolved and started (see config.ini).
	at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLauncher.java:74)
	at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:368)
	at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:179)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
	at java.lang.reflect.Method.invoke(Method.java:324)
	at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:559)
	at org.eclipse.equinox.launcher.Main.basicRun(Main.java:514)
	at org.eclipse.equinox.launcher.Main.run(Main.java:1311)




i' workink with win Xp SP3 
i'll be greateful if you help me .




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