Download mp3 file and store in Ios

Hi Hope you all are doing well. I am new here in ionic and getting problem while storing and downloading file. I want to download a mp3 file and store in IOS but not able to download. My code is below
` downloding(file, name) {
if (this.platform.is(“cordova”)) {

  this.file
    .checkDir(this.file.externalRootDirectory, "Downloads")
    .then(
      // Directory exists, check for file with the same name
      (_) =>
        this.file
          .checkFile(
            this.file.externalRootDirectory,
            "Downloads/" + name + ".mp3"
          )
          .then((_) => {
            alert("A file with the same name already exists!");
          })
          // File does not exist yet, we can save normally
          .catch((err) =>
            this.fileTransfer
              .download(
                file,
                this.file.externalRootDirectory +
                  "/Downloads/" +
                  name +
                  ".mp3"
              )
              .then((entry) => {
                alert("File saved in:  " + entry.nativeURL);
              })
              .catch((err) => {
                alert("Error saving file: " + err.message);
              })
          )
    )
    .catch(
      // Directory does not exists, create a new one
      (err) =>
        this.file
          .createDir(this.file.externalRootDirectory, "Downloads", false)
          .then((response) => {
            alert("New folder created:  " + response.fullPath);
            this.fileTransfer
              .download(
                file,
                this.file.externalRootDirectory +
                  "/Downloads/" +
                  name +
                  ".mp3"
              )
              .then((entry) => {
                alert("File saved in : " + entry.nativeURL);
              })
              .catch((err) => {
                alert("Error saving file:  " + JSON.stringify(err.message));
              });
          })
          .catch((err) => {
            console.log(">>>>>>>>>>>>>>>>>>>>>>>>>", JSON.stringify(err));
            alert(
              'It was not possible to create the dir "downloads". Err: ' +
                JSON.stringify(err.message)
            );
          })
    );
} else {
  // If downloaded by Web Browser
  let link = document.createElement("a");
  link.download = name + ".mp3";
  link.href = file;
  document.body.appendChild(link);
  link.click();
  document.body.removeChild(link);
  link = null;
}

}`

I tried multiple solution from google but all in vain.My error is

Error Link is here https://prnt.sc/uoo4bx

I am to much depressed. Please help me. i would be really thankful to you for such favour.

https://prnt.sc/uoocdg this is the actually probblem i am able to create the directory using

this.file.syncedDataDirectory