HarmonyOS 首选项报错数据报错

使用首选项保存一个string类型，内容使用JSON.stringify(qAdBlockerList) 这个转换，

static putSync(key: string, value: preferences.ValueType) {
  let options: preferences.Options = { name: defaultPreferenceName };
  let prefer: preferences.Preferences | null = null;
  prefer = preferences.getPreferencesSync(getContext(), options)
  prefer.putSync(key,value)
  prefer.flush()
}
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报错：Parameter error. The type of value mast be ValueType.