Here's the error message.

The selected wizard could not be started.
Plug-in com.metamatrix.modeler.modelgenerator.salesforce.ui was unable to load class com.metamatrix.modeler.modelgenerator.salesforce.ui.wizards.SalesforceToRelationalImportWizard.
com.metamatrix.modeler.modelgenerator.salesforce.ui.wizards.SalesforceToRelationalImportWizard

And the stack.
!ENTRY org.eclipse.osgi 2 0 2008-11-14 13:52:41.503
!MESSAGE The activator com.metamatrix.modeler.modelgenerator.salesforce.ui.Activator for bundle com.metamatrix.modeler.modelgenerator.salesforce.ui is invalid
!STACK 0
org.osgi.framework.BundleException: The activator com.metamatrix.modeler.modelgenerator.salesforce.ui.Activator for bundle com.metamatrix.modeler.modelgenerator.salesforce.ui is invalid
at org.eclipse.osgi.framework.internal.core.AbstractBundle.loadBundleActivator(AbstractBundle.java:146)
at org.eclipse.osgi.framework.internal.core.BundleContextImpl.start(BundleContextImpl.java:980)
at org.eclipse.osgi.framework.internal.core.BundleHost.startWorker(BundleHost.java:346)
at org.eclipse.osgi.framework.internal.core.AbstractBundle.start(AbstractBundle.java:265)
at org.eclipse.osgi.framework.util.SecureAction.start(SecureAction.java:400)
at org.eclipse.osgi.framework.internal.core.BundleHost.loadClass(BundleHost.java:234)
at org.eclipse.osgi.framework.internal.core.AbstractBundle.loadClass(AbstractBundle.java:1274)
at org.eclipse.core.internal.registry.osgi.RegistryStrategyOSGI.createExecutableExtension(RegistryStrategyOSGI.java:160)
at org.eclipse.core.internal.registry.ExtensionRegistry.createExecutableExtension(ExtensionRegistry.java:867)
at org.eclipse.core.internal.registry.ConfigurationElement.createExecutableExtension(ConfigurationElement.java:243)
at org.eclipse.core.internal.registry.ConfigurationElementHandle.createExecutableExtension(ConfigurationElementHandle.java:51)
at org.eclipse.ui.internal.WorkbenchPlugin$1.run(WorkbenchPlugin.java:267)
at org.eclipse.swt.custom.BusyIndicator.showWhile(BusyIndicator.java:70)
at org.eclipse.ui.internal.WorkbenchPlugin.createExtension(WorkbenchPlugin.java:263)
at org.eclipse.ui.internal.dialogs.WorkbenchWizardElement.createExecutableExtension(WorkbenchWizardElement.java:117)
at org.eclipse.ui.internal.dialogs.WorkbenchWizardElement.createWizard(WorkbenchWizardElement.java:261)
at org.eclipse.ui.internal.dialogs.ImportExportPage$1.createWizard(ImportExportPage.java:300)
at org.eclipse.ui.internal.dialogs.WorkbenchWizardNode$2.run(WorkbenchWizardNode.java:151)
at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:37)
at org.eclipse.ui.internal.dialogs.WorkbenchWizardNode$1.run(WorkbenchWizardNode.java:135)
at org.eclipse.swt.custom.BusyIndicator.showWhile(BusyIndicator.java:70)
at org.eclipse.ui.internal.dialogs.WorkbenchWizardNode.getWizard(WorkbenchWizardNode.java:132)
at org.eclipse.jface.wizard.WizardSelectionPage.getNextPage(WizardSelectionPage.java:104)
at org.eclipse.ui.internal.dialogs.WorkbenchWizardSelectionPage.getNextPage(WorkbenchWizardSelectionPage.java:100)
at org.eclipse.ui.internal.dialogs.ImportExportPage.getNextPage(ImportExportPage.java:431)
at org.eclipse.jface.wizard.WizardDialog.nextPressed(WizardDialog.java:813)
at org.eclipse.jface.wizard.WizardDialog.buttonPressed(WizardDialog.java:369)
at org.eclipse.jface.dialogs.Dialog$2.widgetSelected(Dialog.java:624)
at org.eclipse.swt.widgets.TypedListener.handleEvent(TypedListener.java:228)
at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:84)
at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1158)
at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:3401)
at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3033)
at org.eclipse.jface.window.Window.runEventLoop(Window.java:825)
at org.eclipse.jface.window.Window.open(Window.java:801)
at org.eclipse.ui.internal.handlers.WizardHandler$Import.executeHandler(WizardHandler.java:146)
at org.eclipse.ui.internal.handlers.WizardHandler.execute(WizardHandler.java:273)
at org.eclipse.ui.internal.handlers.HandlerProxy.execute(HandlerProxy.java:281)
at org.eclipse.core.commands.Command.executeWithChecks(Command.java:476)
at org.eclipse.core.commands.ParameterizedCommand.executeWithChecks(ParameterizedCommand.java:508)
at org.eclipse.ui.internal.handlers.HandlerService.executeCommand(HandlerService.java:169)
at org.eclipse.ui.internal.handlers.SlaveHandlerService.executeCommand(SlaveHandlerService.java:247)
at org.eclipse.ui.internal.actions.CommandAction.runWithEvent(CommandAction.java:157)
at org.eclipse.ui.internal.actions.CommandAction.run(CommandAction.java:171)
at org.eclipse.ui.actions.ImportResourcesAction.run(ImportResourcesAction.java:97)
at org.eclipse.ui.actions.BaseSelectionListenerAction.runWithEvent(BaseSelectionListenerAction.java:168)
at org.eclipse.jface.action.ActionContributionItem.handleWidgetSelection(ActionContributionItem.java:583)
at org.eclipse.jface.action.ActionContributionItem.access$2(ActionContributionItem.java:500)
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:1158)
at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:3401)
at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3033)
at org.eclipse.ui.internal.Workbench.runEventLoop(Workbench.java:2382)
at org.eclipse.ui.internal.Workbench.runUI(Workbench.java:2346)
at org.eclipse.ui.internal.Workbench.access$4(Workbench.java:2198)
at org.eclipse.ui.internal.Workbench$5.run(Workbench.java:493)
at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:288)
at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:488)
at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:149)
at org.eclipse.ui.internal.ide.application.IDEApplication.start(IDEApplication.java:113)
at org.eclipse.equinox.internal.app.EclipseAppHandle.run(EclipseAppHandle.java:193)
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:386)
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:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:549)
at org.eclipse.equinox.launcher.Main.basicRun(Main.java:504)
at org.eclipse.equinox.launcher.Main.run(Main.java:1236)
at org.eclipse.equinox.launcher.Main.main(Main.java:1212)
Caused by: java.lang.ClassNotFoundException: com.metamatrix.modeler.modelgenerator.salesforce.ui.Activator
at org.eclipse.osgi.framework.internal.core.BundleLoader.findClassInternal(BundleLoader.java:481)
at org.eclipse.osgi.framework.internal.core.BundleLoader.findClass(BundleLoader.java:397)
at org.eclipse.osgi.framework.internal.core.BundleLoader.findClass(BundleLoader.java:385)
at org.eclipse.osgi.internal.baseadaptor.DefaultClassLoader.loadClass(DefaultClassLoader.java:87)
at java.lang.ClassLoader.loadClass(ClassLoader.java:251)
at org.eclipse.osgi.framework.internal.core.BundleLoader.loadClass(BundleLoader.java:313)
at org.eclipse.osgi.framework.internal.core.BundleHost.loadClass(BundleHost.java:227)
at org.eclipse.osgi.framework.internal.core.AbstractBundle.loadBundleActivator(AbstractBundle.java:139)
... 73 more
Root exception:
java.lang.ClassNotFoundException: com.metamatrix.modeler.modelgenerator.salesforce.ui.Activator
at org.eclipse.osgi.framework.internal.core.BundleLoader.findClassInternal(BundleLoader.java:481)
at org.eclipse.osgi.framework.internal.core.BundleLoader.findClass(BundleLoader.java:397)
at org.eclipse.osgi.framework.internal.core.BundleLoader.findClass(BundleLoader.java:385)
at org.eclipse.osgi.internal.baseadaptor.DefaultClassLoader.loadClass(DefaultClassLoader.java:87)
at java.lang.ClassLoader.loadClass(ClassLoader.java:251)
at org.eclipse.osgi.framework.internal.core.BundleLoader.loadClass(BundleLoader.java:313)
at org.eclipse.osgi.framework.internal.core.BundleHost.loadClass(BundleHost.java:227)
at org.eclipse.osgi.framework.internal.core.AbstractBundle.loadBundleActivator(AbstractBundle.java:139)
at org.eclipse.osgi.framework.internal.core.BundleContextImpl.start(BundleContextImpl.java:980)
at org.eclipse.osgi.framework.internal.core.BundleHost.startWorker(BundleHost.java:346)
at org.eclipse.osgi.framework.internal.core.AbstractBundle.start(AbstractBundle.java:265)
at org.eclipse.osgi.framework.util.SecureAction.start(SecureAction.java:400)
at org.eclipse.osgi.framework.internal.core.BundleHost.loadClass(BundleHost.java:234)
at org.eclipse.osgi.framework.internal.core.AbstractBundle.loadClass(AbstractBundle.java:1274)
at org.eclipse.core.internal.registry.osgi.RegistryStrategyOSGI.createExecutableExtension(RegistryStrategyOSGI.java:160)
at org.eclipse.core.internal.registry.ExtensionRegistry.createExecutableExtension(ExtensionRegistry.java:867)
at org.eclipse.core.internal.registry.ConfigurationElement.createExecutableExtension(ConfigurationElement.java:243)
at org.eclipse.core.internal.registry.ConfigurationElementHandle.createExecutableExtension(ConfigurationElementHandle.java:51)
at org.eclipse.ui.internal.WorkbenchPlugin$1.run(WorkbenchPlugin.java:267)
at org.eclipse.swt.custom.BusyIndicator.showWhile(BusyIndicator.java:70)
at org.eclipse.ui.internal.WorkbenchPlugin.createExtension(WorkbenchPlugin.java:263)
at org.eclipse.ui.internal.dialogs.WorkbenchWizardElement.createExecutableExtension(WorkbenchWizardElement.java:117)
at org.eclipse.ui.internal.dialogs.WorkbenchWizardElement.createWizard(WorkbenchWizardElement.java:261)
at org.eclipse.ui.internal.dialogs.ImportExportPage$1.createWizard(ImportExportPage.java:300)
at org.eclipse.ui.internal.dialogs.WorkbenchWizardNode$2.run(WorkbenchWizardNode.java:151)
at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:37)
at org.eclipse.ui.internal.dialogs.WorkbenchWizardNode$1.run(WorkbenchWizardNode.java:135)
at org.eclipse.swt.custom.BusyIndicator.showWhile(BusyIndicator.java:70)
at org.eclipse.ui.internal.dialogs.WorkbenchWizardNode.getWizard(WorkbenchWizardNode.java:132)
at org.eclipse.jface.wizard.WizardSelectionPage.getNextPage(WizardSelectionPage.java:104)
at org.eclipse.ui.internal.dialogs.WorkbenchWizardSelectionPage.getNextPage(WorkbenchWizardSelectionPage.java:100)
at org.eclipse.ui.internal.dialogs.ImportExportPage.getNextPage(ImportExportPage.java:431)
at org.eclipse.jface.wizard.WizardDialog.nextPressed(WizardDialog.java:813)
at org.eclipse.jface.wizard.WizardDialog.buttonPressed(WizardDialog.java:369)
at org.eclipse.jface.dialogs.Dialog$2.widgetSelected(Dialog.java:624)
at org.eclipse.swt.widgets.TypedListener.handleEvent(TypedListener.java:228)
at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:84)
at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1158)
at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:3401)
at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3033)
at org.eclipse.jface.window.Window.runEventLoop(Window.java:825)
at org.eclipse.jface.window.Window.open(Window.java:801)
at org.eclipse.ui.internal.handlers.WizardHandler$Import.executeHandler(WizardHandler.java:146)
at org.eclipse.ui.internal.handlers.WizardHandler.execute(WizardHandler.java:273)
at org.eclipse.ui.internal.handlers.HandlerProxy.execute(HandlerProxy.java:281)
at org.eclipse.core.commands.Command.executeWithChecks(Command.java:476)
at org.eclipse.core.commands.ParameterizedCommand.executeWithChecks(ParameterizedCommand.java:508)
at org.eclipse.ui.internal.handlers.HandlerService.executeCommand(HandlerService.java:169)
at org.eclipse.ui.internal.handlers.SlaveHandlerService.executeCommand(SlaveHandlerService.java:247)
at org.eclipse.ui.internal.actions.CommandAction.runWithEvent(CommandAction.java:157)
at org.eclipse.ui.internal.actions.CommandAction.run(CommandAction.java:171)
at org.eclipse.ui.actions.ImportResourcesAction.run(ImportResourcesAction.java:97)
at org.eclipse.ui.actions.BaseSelectionListenerAction.runWithEvent(BaseSelectionListenerAction.java:168)
at org.eclipse.jface.action.ActionContributionItem.handleWidgetSelection(ActionContributionItem.java:583)
at org.eclipse.jface.action.ActionContributionItem.access$2(ActionContributionItem.java:500)
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:1158)
at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:3401)
at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3033)
at org.eclipse.ui.internal.Workbench.runEventLoop(Workbench.java:2382)
at org.eclipse.ui.internal.Workbench.runUI(Workbench.java:2346)
at org.eclipse.ui.internal.Workbench.access$4(Workbench.java:2198)
at org.eclipse.ui.internal.Workbench$5.run(Workbench.java:493)
at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:288)
at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:488)
at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:149)
at org.eclipse.ui.internal.ide.application.IDEApplication.start(IDEApplication.java:113)
at org.eclipse.equinox.internal.app.EclipseAppHandle.run(EclipseAppHandle.java:193)
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:386)
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:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:549)
at org.eclipse.equinox.launcher.Main.basicRun(Main.java:504)
at org.eclipse.equinox.launcher.Main.run(Main.java:1236)
at org.eclipse.equinox.launcher.Main.main(Main.java:1212)