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mat-error *ngIf, custom validator, and FormGroup do not work together · Issue #10956 · angular/material · GitHub
![Get Validation error message angular reactive forms | reactive forms in angular | Angular Tutorial - YouTube Get Validation error message angular reactive forms | reactive forms in angular | Angular Tutorial - YouTube](https://i.ytimg.com/vi/z5_sZZGBNeA/maxresdefault.jpg)
Get Validation error message angular reactive forms | reactive forms in angular | Angular Tutorial - YouTube
input] Add example of using mat-error with parent formgroup validation · Issue #8513 · angular/components · GitHub
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