Angular Material forms validation errors -


i have material form in have input box:

<md-form-field class="input-full-width">     <input mdinput class="form-control emp-info-input" type="text" placeholder="description" formcontrolname="perioddesc">     <md-error *ngif="perioddesc.errors.required">this field required</md-error> </md-form-field>

formbuilder:

this.apprperiod = this.fb.group({       'perioddesc' : new formcontrol(this.perioddesc, [validators.required,validators.maxlength(50)])     }, {validator: customvalidator.validate});

i following error while loading:

error typeerror: cannot read property 'haserror' of undefined
@ object.testcomponent._co [as updatedirectives] (test.html:33)
@ object.debugupdatedirectives [as updatedirectives] (core.es5.js:13075)
@ checkandupdateview (core.es5.js:12255)
@ callviewaction (core.es5.js:12620)
@ execcomponentviewsaction (core.es5.js:12552)
@ checkandupdateview (core.es5.js:12261)
@ callviewaction (core.es5.js:12620)
@ execembeddedviewsaction (core.es5.js:12578)
@ checkandupdateview (core.es5.js:12256)
@ callviewaction (core.es5.js:12620)

because have control form :

<md-error *ngif="apprperiod.get('perioddesc').errors.required">this field required</md-error>

or 

<md-error *ngif="apprperiod.haserror('required', ['perioddesc'])">this field required</md-error>

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