__zone_symbol__currentTask Exception

I encountered an Error message:

{"__zone_symbol_currentTask":{"type":"microTask","state":"notScheduled","source":"Promise.then","zone":"angular","cancelFn":null,"runCount":0}}

Here is the corresponding code snippet:

async getNewData(id: number, path: string, howMany: number) {
    let fileManagement: FileManagement = new FileManagement();
    let result: any = null;
    switch (id) {
        case 0:
            alert("pfad: " + path);
            await fileManagement.readFile(path + "Tasks/", "task_" + howMany + ".tsk").then((text) => {
                alert("text: " + text);
                result = JSON.parse(text);
                alert("completed");
            }).catch((error)=>{
                alert("error encountered: " + JSON.stringify(error));
            });
        default:
            result = JSON.parse(this.getDataFromComponent(id, howMany, path));
        //code to call components for generation
    }
    return result;
}
constructor(public navCtrl: NavController, private tts: TextToSpeech, navParams: NavParams) {
    this.path = navParams.get('path'); //PASS EXERCISE FOLDER PATH HERE
    this.newData.getNewData(0, this.path, this.fileCounter).then((data) => {
      this.buffer = data;
      this.fileCounter++;
      this.nextChoice(0);
    }).catch((error) => {
      alert(JSON.stringify(error)); //error handling here
    });
  }

Can anyone explain why this error is occurring and suggest a solution? Appreciate any guidance!

Answer №1

It's worth mentioning that spotting the original error in this code may pose a challenge since it relies partly on external dependencies. Rather than uncovering the initial mistake, this "answer" aims to guide you in pinpointing why you're encountering an incomplete error message and how you can reveal the true error message. I trust this information proves beneficial to you!

The Root of the Missing Error Data

The issue you're facing is obscured by two key points:

  1. The __zone_symbol_currentTask is an additional property Angular inserts into the Error object.
  2. JSON.stringify doesn't display the Error object's inherent properties (by default)

Hence, the only error property visible in the JSONified output is the peculiar-looking property introduced by Angular.

Solution

To log the details of your underlying error, consider the following approach:

JSON.stringify(err, Object.getOwnPropertyNames(err))

While it's not typically recommended, you could eliminate the property Angular adds if it's particularly bothersome:

delete error.__zone_symbol__currentTask

For additional information, check out: Is it not possible to stringify an Error using JSON.stringify?

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