Cannot create extension

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Stack trace

  • org.eclipse.core.runtime.CoreException: Cannot create extension at org.eclipse.ui.internal.WorkbenchPlugin.createExtension( at org.eclipse.ui.internal.registry.EditorDescriptor.createEditor( at org.eclipse.ui.internal.EditorReference.createPart( at org.eclipse.ui.internal.e4.compatibility.CompatibilityPart.createPart( at org.eclipse.ui.internal.e4.compatibility.CompatibilityEditor.createPart(

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