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org.eclipse.swt.SWTException: Invalid thread access at org.eclipse.swt.SWT.error(SWT.java:3884) at org.eclipse.swt.SWT.error(SWT.java:3799) at org.eclipse.swt.SWT.error(SWT.java:3770) at org.eclipse.swt.widgets.Widget.error(Widget.java:463) at org.eclipse.swt.widgets.Widget.checkWidget(Widget.java:355) at org.eclipse.swt.widgets.Shell.setModified(Shell.java:1648) at org.eclipse.ui.internal.SaveAction.setEnabled(SaveAction.java:111) at org.eclipse.ui.internal.SaveAction.updateState(SaveAction.java:95) at org.eclipse.ui.internal.BaseSaveAction$1.propertyChanged(BaseSaveAction.java:46) at org.eclipse.ui.part.WorkbenchPart.firePropertyChange(WorkbenchPart.java:129) at org.fordiac.systemmanagement.ui.views.SystemGeneralInformation.setDirty(SystemGeneralInformation.java:72) at org.fordiac.systemmanagement.ui.views.SystemGeneralInformation.access$0(SystemGeneralInformation.java:70) at org.fordiac.systemmanagement.ui.views.SystemGeneralInformation$1.notifyChanged(SystemGeneralInformation.java:51) at org.eclipse.emf.common.notify.impl.BasicNotifierImpl.eNotify(BasicNotifierImpl.java:280) at org.fordiac.ide.model.libraryElement.impl.AutomationSystemImpl.setPalette(AutomationSystemImpl.java:160) at org.fordiac.systemmanagement.SystemManager.loadSystems(SystemManager.java:253) at org.fordiac.systemmanagement.SystemManager.access$1(SystemManager.java:233) at org.fordiac.systemmanagement.SystemManager$1.resourceChanged(SystemManager.java:159) at org.eclipse.core.internal.events.NotificationManager$2.run(NotificationManager.java:291) at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42) at org.eclipse.core.internal.events.NotificationManager.notify(NotificationManager.java:285) at org.eclipse.core.internal.events.NotificationManager.handleEvent(NotificationManager.java:261) at org.eclipse.core.internal.resources.Workspace.broadcastEvent(Workspace.java:307) at org.eclipse.core.internal.resources.Resource.broadcastPreDeleteEvent(Resource.java:1821) at org.eclipse.core.internal.resources.Resource.delete(Resource.java:709) at org.eclipse.core.internal.resources.Project.delete(Project.java:309) at org.eclipse.ui.ide.undo.WorkspaceUndoUtil.delete(WorkspaceUndoUtil.java:579) at org.eclipse.ui.ide.undo.WorkspaceUndoUtil.delete(WorkspaceUndoUtil.java:171) at org.eclipse.ui.ide.undo.AbstractResourcesOperation.delete(AbstractResourcesOperation.java:119) at org.eclipse.ui.ide.undo.DeleteResourcesOperation.doExecute(DeleteResourcesOperation.java:67) at org.eclipse.ui.ide.undo.AbstractWorkspaceOperation$1.run(AbstractWorkspaceOperation.java:206) at org.eclipse.core.internal.resources.Workspace.run(Workspace.java:1800) at org.eclipse.ui.ide.undo.AbstractWorkspaceOperation.execute(AbstractWorkspaceOperation.java:204) at org.eclipse.ui.actions.DeleteResourceAction$5.run(DeleteResourceAction.java:570) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:55)