at-form-field must contain a MatFormFieldContro code example

Example 1: mat-form-field must contain a MatFormFieldControl

@NgModule({
    imports: [
        MatInputModule
    ],
    exports: [
        MatInputModule
    ]
})

Example 2: mat-form-field must contain a MatFormFieldControl

Maybe you need to close <input> tag:

<!-- Wrong -->
<mat-form-field>
  <input matInput>
</mat-form-field>

<!-- Right -->
<mat-form-field>
  <input matInput />
</mat-form-field>