请有人能告诉我为什么我的代码返回错误代码

回调：功能（响应）{

     //verification of payment before proceeing with next allowSyntheticDefaultImports
     // post to server to verify transaction before giving value
    let  verifyresponse=self.vtpassprovider.verifyPayment(response.reference).then(data =>{
      this.responseData=data;
      console.log("Response is herejj" +JSON.stringify(data['data']['authorization']['authorization_code']));

       this.restProvider.addLog("111","","info","ServiceCall_Response","History"+"899292");

    },err => {
      console.log('Fetch Error: ',err);
    })

    console.log(response);

//返回错误 polyfills.js：3未处理的承诺拒绝：无法读取undefined的属性'addLog'；区域：任务：Promise.then;值：TypeError：无法读取未定义的属性'addLog'