字符串资源引用出错，该怎么办啊？

{ 
            id: '1', 
            style: InAppItemStyle.Arrow, 
            mainText: $r('app.string.about'), 
            desc: $r('app.string.version')+this.settingsVM.getVersion(), 
            handler: () => { 
              router.pushUrl({ 
                url: PageUrl.ABOUT, 
              }); 
            }, 
}
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 onConfigurationUpdate(config: Configuration): void { 
    ... 
    //设置当前语言 
    AppStorage.setOrCreate('PAF.language',config.language) 
  }
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@Entry 
@Component 
struct SettingPages { 
  @StorageProp('PAF.language') @Watch('onSystemLanguage') private version: string =""; 
... 
 aboutToAppear(){ 
   ... 
    this.buildParams(); 
  } 
/** 
   * 获取字符串的值 
   */ 
  async getSettingValue(params: string, key: string): Promise<string> { 
    if (!params) { 
      return ''; 
    } 
    let value: string; 
    if (params.startsWith(key)) { 
      if (key === '$media:') { 
        value = await getContext(this).resourceManager.getMediaBase64ByName(params.split(':').reverse()[0]); 
        return value; 
      } else if (key === '$string:') { 
        value = await getContext(this).resourceManager.getStringByName(params.split(':').reverse()[0]); 
        return value; 
      } else { 
        value =params; 
        return value; 
      } 
    } else { 
      value =params; 
      return value; 
    } 
  } 
  
  onSystemLanguage() { 
    this.buildParams(); 
  } 
  
  async buildParams(){ 
    this.version=await this.getSettingValue('$string:version',"$string:") 
  } 
... 
}
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