set error " errors : {__zone_symbol__state: null, __zone_symbol__value: Array(0)}" by Angular...

Mobile mobileNumberValidator returns fine but the other two validators returns a null promise on errors. Cant identify the mistake i have done here. Please help. Those two validators sets errors in formbuilder object as follows

errors : {__zone_symbol__state: null, __zone_symbol__value: Array(0)}

In form builder group

this.empInfoForm = this.fb.group({
'Mobile': [null, [Validators.required], [this.mobileNumberValidator.bind(this)]],
'Private': [null, [this.privateNumberValidator.bind(this)]],
'Work': [null, [this.workNumberValidator.bind(this)]],
});


Validator Methods

mobileNumberValidator(control: AbstractControl) {

return new Promise(resolve => {
setTimeout(() => {
if (!this.isMobileNumberValid) {
resolve({
'phoneNumber': true

})
console.log(this.empInfoForm)
} else {
resolve(null);
}
}, 10);
})
}
workNumberValidator(control: AbstractControl) {

return new Promise(resolve => {
setTimeout(() => {
if (!this.isWorkNumberValid) {
resolve({
'phoneNumber': true

})
console.log(this.empInfoForm)
} else {
resolve(null);
}
}, 10);
})
}
privateNumberValidator(control: AbstractControl) {

return new Promise(resolve => {
setTimeout(() => {
if (!this.isPrivateNumberValid) {
resolve({
'phoneNumber': true

})

console.log(this.empInfoForm)
} else {
resolve(null);
}
}, 10);
})
}

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