How to create Dropdown required message

[hrn07]

Hi ,
First of all sorry for my bad english level.
I have a project with primereact sakai template. I used primereact dropdown but I didn't custom error message for required attribute.

<Dropdown
name="unitId"
onChange={handleChange}
value={id}
options={units}
optionLabel="unitName"
optionValue="id"
filter
showClear
filterBy="unitName"
placeholder="Select a Unit"
required
/>

I am using required attribute as in this code example. When I want to submit the form with Submit button my page does not post ok, but I can't see the error message anywhere on the page.

[Melloware]

I suggest checking out the showcase for Form Validation examples: https://primefaces.org/primereact/formik/