When I want to install a plugin Obeo Designer on eclipse modeling I have this error :
Cannot complete the install because of a conflicting dependency.
Software being installed: Sirius Specification Environment 3.1.7.201611021249 (org.eclipse.sirius.specifier.ide.ui.feature.group 3.1.7.201611021249)
Software currently installed: Eclipse Modeling Tools 1.5.1.20120917-1257 (epp.package.modeling 1.5.1.20120917-1257)
Only one of the following can be installed at once:
PDE Core 3.11.1.v20161115-1951 (org.eclipse.pde.core 3.11.1.v20161115-1951)
PDE Core 3.8.1.v20130115-200504 (org.eclipse.pde.core 3.8.1.v20130115-200504)
PDE Core 3.10.102.v20160128-0556 (org.eclipse.pde.core 3.10.102.v20160128-0556)
PDE Core 3.8.0.v20120606-170547 (org.eclipse.pde.core 3.8.0.v20120606-170547)
Only one of the following can be installed at once:
Eclipse Workbench User Guide 4.2.0.v20120829-072800 (org.eclipse.platform.doc.user 4.2.0.v20120829-072800)
Eclipse Workbench User Guide 4.6.1.v20160727-2009 (org.eclipse.platform.doc.user 4.6.1.v20160727-2009)
Eclipse Workbench User Guide 4.2.2.v20130121-200410 (org.eclipse.platform.doc.user 4.2.2.v20130121-200410)
Eclipse Workbench User Guide 4.5.1.v20150819-1130 (org.eclipse.platform.doc.user 4.5.1.v20150819-1130)
Eclipse Workbench User Guide 4.2.0.v20120606-135340 (org.eclipse.platform.doc.user 4.2.0.v20120606-135340)
Cannot satisfy dependency:
From: Eclipse Modeling Tools 1.5.1.20120917-1257 (epp.package.modeling 1.5.1.20120917-1257)
To: org.eclipse.epp.package.modeling.feature.feature.group [1.5.1.20120917-1257]
Cannot satisfy dependency:
From: EPP Modeling Feature 1.5.1.20120917-1257 (org.eclipse.epp.package.modeling.feature.feature.group 1.5.1.20120917-1257)
To: org.eclipse.platform.feature.group [4.2.1.v20120814-120134-9JF7BHVGFyMveli1uX6aTH0q-eAap6PAgOP5mO]
I think obeo-designer doesn't support Juno, I would recommend Luna,
https://marketplace.eclipse.org/content/obeo-designer-community
Supported versions: Mars (4.5), Luna (4.4), Oxygen (4.7), Neon (4.6)