What causes the “control.registerOnChange is not a function” error

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Yes, that error message is a bit cryptic, but if you use FormBuilder, you would see this when you added a control to FormGroup in your component and named it “A”, but then either forgot to add input with formControlName=”A” to your template, or formControlName for the intended input is not A, or empty, or not present.

Basically, it says: “I cannot match the control I have in FormGroup to the control in the template”.

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