I found many errors in the Eclipse log:

eclipse.buildId=I20110613-1736
java.version=1.6.0_22
java.vendor=Sun Microsystems Inc.
BootLoader constants: OS=linux, ARCH=x86, WS=gtk, NL=en_US
Command-line arguments:  -os linux -ws gtk -arch x86

Error
Sun Jul 24 14:17:40 CEST 2011
Problems occurred when invoking code from plug-in: "org.eclipse.jface".

java.lang.NullPointerException
    at org.erlide.core.backend.BackendData.<init>(BackendData.java:53)
    at
org.erlide.core.backend.manager.BackendFactory.getIdeBackendData(BackendFactory.java:66)
    at
org.erlide.core.backend.manager.BackendFactory.createIdeBackend(BackendFactory.java:35)
    at
org.erlide.core.backend.manager.BackendManager.getIdeBackend(BackendManager.java:191)
    at
org.erlide.ui.prefs.CompilerPreferencePage.optionsAreOk(CompilerPreferencePage.java:444)
    at
org.erlide.ui.prefs.CompilerPreferencePage$2.modifyText(CompilerPreferencePage.java:107)
    at
org.eclipse.swt.widgets.TypedListener.handleEvent(TypedListener.java:179)
    at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:84)
    at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1258)
    at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1282)
    at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1263)
    at org.eclipse.swt.widgets.Text.setText(Text.java:2175)
    at org.eclipse.swt.widgets.Text.setText(Text.java:2111)
    at
org.erlide.ui.prefs.CompilerPreferencePage.createContents(CompilerPreferencePage.java:130)
    at
org.eclipse.jface.preference.PreferencePage.createControl(PreferencePage.java:232)
    at
org.eclipse.jface.preference.PreferenceDialog.createPageControl(PreferenceDialog.java:1501)
    at
org.eclipse.jface.preference.PreferenceDialog$14.run(PreferenceDialog.java:1258)
    at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42)
    at org.eclipse.ui.internal.JFaceUtil$1.run(JFaceUtil.java:49)
    at org.eclipse.jface.util.SafeRunnable.run(SafeRunnable.java:175)
    at
org.eclipse.jface.preference.PreferenceDialog.showPage(PreferenceDialog.java:1252)
    at
org.eclipse.ui.internal.dialogs.FilteredPreferenceDialog.showPage(FilteredPreferenceDialog.java:674)
    at
org.eclipse.jface.preference.PreferenceDialog$10.run(PreferenceDialog.java:708)
    at org.eclipse.swt.custom.BusyIndicator.showWhile(BusyIndicator.java:70)
    at
org.eclipse.jface.preference.PreferenceDialog$9.selectionChanged(PreferenceDialog.java:704)
    at
org.eclipse.jface.viewers.StructuredViewer$3.run(StructuredViewer.java:888)
    at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42)
    at org.eclipse.ui.internal.JFaceUtil$1.run(JFaceUtil.java:49)
    at org.eclipse.jface.util.SafeRunnable.run(SafeRunnable.java:175)
    at
org.eclipse.jface.viewers.StructuredViewer.firePostSelectionChanged(StructuredViewer.java:886)
    at
org.eclipse.jface.viewers.StructuredViewer.handlePostSelect(StructuredViewer.java:1226)
    at
org.eclipse.jface.viewers.StructuredViewer$5.widgetSelected(StructuredViewer.java:1251)
    at
org.eclipse.jface.util.OpenStrategy.firePostSelectionEvent(OpenStrategy.java:262)
    at org.eclipse.jface.util.OpenStrategy.access$5(OpenStrategy.java:256)
    at org.eclipse.jface.util.OpenStrategy$3.run(OpenStrategy.java:433)
    at org.eclipse.swt.widgets.RunnableLock.run(RunnableLock.java:35)
    at
org.eclipse.swt.widgets.Synchronizer.runAsyncMessages(Synchronizer.java:135)
    at org.eclipse.swt.widgets.Display.runAsyncMessages(Display.java:3563)
    at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3212)
    at org.eclipse.jface.window.Window.runEventLoop(Window.java:825)
    at org.eclipse.jface.window.Window.open(Window.java:801)
    at
org.eclipse.ui.dialogs.PropertyDialogAction.run(PropertyDialogAction.java:158)
    at org.eclipse.jface.action.Action.runWithEvent(Action.java:498)
    at
org.eclipse.jface.action.ActionContributionItem.handleWidgetSelection(ActionContributionItem.java:584)
    at
org.eclipse.jface.action.ActionContributionItem.access$2(ActionContributionItem.java:501)
    at
org.eclipse.jface.action.ActionContributionItem$5.handleEvent(ActionContributionItem.java:411)
    at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:84)
    at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1258)
    at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:3588)
    at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3209)
    at org.eclipse.ui.internal.Workbench.runEventLoop(Workbench.java:2696)
    at org.eclipse.ui.internal.Workbench.runUI(Workbench.java:2660)
    at org.eclipse.ui.internal.Workbench.access$4(Workbench.java:2494)
    at org.eclipse.ui.internal.Workbench$7.run(Workbench.java:674)
    at
org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:332)
    at
org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:667)
    at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:149)
    at
org.eclipse.ui.internal.ide.application.IDEApplication.start(IDEApplication.java:123)
    at
org.eclipse.equinox.internal.app.EclipseAppHandle.run(EclipseAppHandle.java:196)
    at
org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(EclipseAppLauncher.java:110)
    at
org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLauncher.java:79)
    at
org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:344)
    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:57)
    at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:616)
    at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:622)
    at org.eclipse.equinox.launcher.Main.basicRun(Main.java:577)
    at org.eclipse.equinox.launcher.Main.run(Main.java:1410)
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