Unable to choose element from custom alert using appium and webdriver.io

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1

I am working on automation testing, for that i have used webdriver.io and appium. i want to select element from the custom alert which is having list of radio button, when i used waitForExist for the element which i want to choose then i got response true, but when i tried to click on that element then i got error Error: An element could not be located on the page using the given search parameters ("//*[@id=“alert-input-0-0”]"), i have created custom alert in ionic 2 which is below…

var options = {
      title: 'SortBy',
      inputs: [],
      buttons: [
        {
          text: 'Cancel'
        },
        {
          text: 'Ok',
          handler: data => {

          }
        }
      ]
    };

    options.inputs = [];


    for (let i = 0; i < this.sortOpts.length; i++) {
      options.inputs.push({ value: i, label: this.sortOpts[i], type: 'radio', checked: this.checkedSort[i] });
    }

    // Create the alert with the options
    let alert = this.alertCtrl.create(options);
    alert.present();

and the test case is below…

client.waitForExist('//*[@id="alert-input-0-0"]', 20000, true) 
       .then(function () {
          console.log("exits....")

          client.element('//*[@id="alert-input-0-0"]')
          .click()                                            
          .then(function () {

                console.log("cliked....")
          })
         .catch(function (err) {
                console.log("Error received: >>>>>> " + err);
          })
    })
    .catch(function (err) {
         console.log("Error received: >>>>>> " + err);
    })

i’m able to find button, title and radio option also but unable to select or click on radio option, unable to click on first option from radio group list and getting error as above. can anyone help me to solve this?