Enables #35333

src/vs/workbench/parts/tasks/electron-browser/task.contribution.ts

@@ -797,6 +797,10 @@ class TaskService extends EventEmitter implements ITaskService {
 	}
 
 	public getTask(folder: IWorkspaceFolder | string, alias: string): TPromise<Task> {
+		let name = Types.isString(folder) ? folder : folder.name;
+		if (this.ignoredWorkspaceFolders.some(ignored => ignored.name === name)) {
+			return TPromise.wrapError(new Error(nls.localize('TaskServer.folderIgnored', 'The folder {0} is ignored since it uses task version 0.1.0', name)));
+		}
 		return this.getGroupedTasks().then((map) => {
 			let values = map.get(folder);
 			if (!values) {