但是我收到了一个错误

error_handler.js:46 EXCEPTION: _this.subscribe is not a function

当我尝试添加自定义验证器时

validator.ts

import {Control} from "angular/common";

 interface ValidationResult {
     [key: string]: any;
 }

 export class CustomValidators {

     static validateChecked(c: Control): ValidationResult {
         return (c.value);
     }
 }

Component.ts

import {Component} from '@angular/core';

import {FormBuilder,FormGroup,Validators,FormControl} from '@angular/forms';
import {CustomValidators} from './validators.ts'

@Component({
    selector: 'wizard',templateUrl: './template.html',})

/**
 * @todo - check how first select is automatically active
 * @todo - export form presets to form class
 */
export class Wizard {
    myForm: FormGroup;

    privacy: boolean;


    // Prefilling the FormBuilder
    constructor(private horizonService: HorizonService,fb: FormBuilder) {
        this.myForm = fb.group({
            'privacy': ['',Validators.required,CustomValidators.validateChecked],});
    }

    onSubmit(values: string): void {
        console.log('you submitted value: ',values);
    }
}