Display error in toast from imperative call

Question

I am trying to show the error message from the apex method exception as a toast message while doing imperative call in lwc. I am using ldsUtil.js to simplify the error message. But either way, I am not getting the error message in a toast.

        this.error = reduceErrors(error);
        console.log('error in save :'+error);
        console.log('reduceErrors(error) :'+this.error);

All above 3 lines are printing the error successfully but when I am trying pass reduceErrors(error) or this.error in toast message, the message is coming blank. See screenshot. What am I doing wrong?

    .catch(error =>{
        this.error = reduceErrors(error);
        console.log('error in save :'+error);
        console.log('reduceErrors(error) :'+this.error);
        const event = new ShowToastEvent({
            title: 'Save status',
            message: this.error,
            //message: reduceErrors(error),
            variant: 'error',
        });
        this.dispatchEvent(event);
    });

Imported Modules :

import { LightningElement, wire, api } from 'lwc';
import { ShowToastEvent } from 'lightning/platformShowToastEvent';
import { reduceErrors } from 'c/ldsUtils';
import saveStatus from '@salesforce/apex/MyClass.saveStatus';

ldsUtils Link: https://github.com/trailheadapps/lwc-recipes/tree/main/force-app/main/default/lwc/ldsUtils

Answer 1

Try the below to see if this helps

const event = new ShowToastEvent({
                title: 'Save status',
                message: error.body.message,
                variant: 'error'
            });
this.dispatchEvent(event);

Answer 2

Finally, it worked. Tried with return value from reduceErrors inside JSON.stringify and it works like a charm even for the custom exceptions thrown using CalloutException.

Apex Custom Error:

    CalloutException e = new CalloutException();
    e.setMessage('Parameters are blank. Please contact your Administrator!');
    throw e;   

LWC Js:

            this.showToastNotice('Product Setup',JSON.stringify(this.error),'error');