Salut

Je galère fortement pour installer Visual Editor (V1.4). J'ai fouillé un peu partout (FAQ, tutoriels, etc) mais je tombe toujours sur le même problème.
Je travaille avec Eclipse Galileo version :

Eclipse IDE for Java Developers
Build id: 20100218-1602
Lorsque je veux installer Visual Editor voici ca que j'ai comme erreur

Cannot complete the install because of a conflicting dependency.
Software being installed: Java EMF Model SDK 1.4.0.v20090826-1446-377-84M2IaeLhpiUslQArckxjIhH (org.eclipse.jem.sdk.feature.group 1.4.0.v20090826-1446-377-84M2IaeLhpiUslQArckxjIhH)
Software currently installed: Eclipse IDE for Java Developers 1.2.2.20100216-1730 (epp.package.java 1.2.2.20100216-1730)
Only one of the following can be installed at once:
Java EMF Model Utilities 2.0.200.v200905140200 (org.eclipse.jem.util 2.0.200.v200905140200)
Java EMF Model Utilities 2.0.201.v201001252130 (org.eclipse.jem.util 2.0.201.v201001252130)
Java EMF Model Utilities 2.0.200.R3_1_maintenance (org.eclipse.jem.util 2.0.200.R3_1_maintenance)
Cannot satisfy dependency:
From: Eclipse IDE for Java Developers 1.2.2.20100216-1730 (epp.package.java 1.2.2.20100216-1730)
To: org.eclipse.epp.package.java.feature.feature.group [1.2.2.20100216-1730]
Cannot satisfy dependency:
From: EPP Java Package 1.2.2.20100216-1730 (org.eclipse.epp.package.java.feature.feature.group 1.2.2.20100216-1730)
To: org.eclipse.wst.xml_ui.feature.feature.group 0.0.0
Cannot satisfy dependency:
From: Java EMF Model 1.4.0.v20090826-1446-7H-FPbAcggQleH8hJifHfUd (org.eclipse.jem.feature.group 1.4.0.v20090826-1446-7H-FPbAcggQleH8hJifHfUd)
To: org.eclipse.jem.util [2.0.200.R3_1_maintenance]
Cannot satisfy dependency:
From: Java EMF Model SDK 1.4.0.v20090826-1446-377-84M2IaeLhpiUslQArckxjIhH (org.eclipse.jem.sdk.feature.group 1.4.0.v20090826-1446-377-84M2IaeLhpiUslQArckxjIhH)
To: org.eclipse.jem.feature.group [1.4.0.v20090826-1446-7H-FPbAcggQleH8hJifHfUd]
Cannot satisfy dependency:
From: WST Common Core 3.1.1.v200908102300-7B77FZ3F7RZHIVI9QdN4PM (org.eclipse.wst.common_core.feature.feature.group 3.1.1.v200908102300-7B77FZ3F7RZHIVI9QdN4PM)
To: org.eclipse.jem.util [2.0.200.v200905140200]
Cannot satisfy dependency:
From: WST Common Core 3.1.1.v200908102300-7B77FZ6F7RZHKDIwRlOwUN (org.eclipse.wst.common_core.feature.feature.group 3.1.1.v200908102300-7B77FZ6F7RZHKDIwRlOwUN)
To: org.eclipse.jem.util [2.0.201.v201001252130]
Cannot satisfy dependency:
From: WST Common UI 3.1.1.v200908102300-7B5FRGDhdMNPnndenAjpWJAReO5Q (org.eclipse.wst.common_ui.feature.feature.group 3.1.1.v200908102300-7B5FRGDhdMNPnndenAjpWJAReO5Q)
To: org.eclipse.wst.common_core.feature.feature.group [3.1.1.v200908102300-7B77FZ3F7RZHIVI9QdN4PM]
Cannot satisfy dependency:
From: WST Common UI 3.1.1.v200908102300-7B5FRHDhdMOGnoekn4gtEJxSmPxV (org.eclipse.wst.common_ui.feature.feature.group 3.1.1.v200908102300-7B5FRHDhdMOGnoekn4gtEJxSmPxV)
To: org.eclipse.wst.common_core.feature.feature.group [3.1.1.v200908102300-7B77FZ6F7RZHKDIwRlOwUN]
Cannot satisfy dependency:
From: Eclipse XML Editors and Tools 3.1.1.v200907161031-7H6FM_DxtkM-7aeTHKEBbQqcZOZ2 (org.eclipse.wst.xml_ui.feature.feature.group 3.1.1.v200907161031-7H6FM_DxtkM-7aeTHKEBbQqcZOZ2)
To: org.eclipse.wst.common_ui.feature.feature.group [3.1.1.v200908102300-7B5FRGDhdMNPnndenAjpWJAReO5Q]
Cannot satisfy dependency:
From: Eclipse XML Editors and Tools 3.1.1.v200907161031-7H6FMbDxtkMs9OeLGF98LRhdPKeo (org.eclipse.wst.xml_ui.feature.feature.group 3.1.1.v200907161031-7H6FMbDxtkMs9OeLGF98LRhdPKeo)
To: org.eclipse.wst.common_ui.feature.feature.group [3.1.1.v200908102300-7B5FRHDhdMOGnoekn4gtEJxSmPxV]
Voici les seuls modules que j'ai pu installer.
Visual Editor 1.4.0.v20090826-1446-777N-CcNBC0BwNk5HZZk org.eclipse.ve.feature.group
Visual Editor SDK 1.4.0.v20090826-1446-57F-9xKEUXK5__GAVDlmFRiymDdO org.eclipse.ve.sdk.feature.group
Visual Editor Source 1.4.0.v20090826-1446-777N-CcNBC0BwNk5HZZk org.eclipse.ve.source.feature.group
Mais apparemment ça ne suffit pas car je n'arrive pas à lancer Visual Editor tel que c'est indiqué dans les tutoriels, comme celui-ci par exemple

Si quelqu'un peut m'expliquer d'où vient le problème ?

Merci d'avance pour votre aide