java.lang.ClassCastException: java.lang.String cannot be cast to java.lang.Boolean

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java.lang.ClassCastException: java.lang.String cannot be cast to java.lang.Boolean
at it.unibz.instasearch.jobs.IndexUpdateJob.propertyChange(IndexUpdateJob.java:259)
at org.eclipse.ui.preferences.ScopedPreferenceStore$3.run(ScopedPreferenceStore.java:350)
at org.eclipse.ui.preferences.ScopedPreferenceStore.firePropertyChangeEvent(ScopedPreferenceStore.java:346)
at org.eclipse.core.internal.preferences.EclipsePreferences.firePreferenceEvent(EclipsePreferences.java:851)
at org.eclipse.oomph.preferences.util.PreferencesUtil$PreferenceProperty.set(PreferencesUtil.java:866)
at org.eclipse.oomph.setup.impl.PreferenceTaskImpl$1.run(PreferenceTaskImpl.java:394)
at org.eclipse.oomph.setup.impl.SetupTaskImpl$1.run(SetupTaskImpl.java:929)
at org.eclipse.oomph.ui.UIUtil$7.run(UIUtil.java:630)

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