"%fieldName is a required field.", in Magento2 REST API Call for GET Method Type

Question

Calling this http://localhost/XXX/rest/V1/XXX/uid/2

and My Model Code is

/**
     * Returns greeting message to user
     *
     * @api
     * @param int $uid User Id.
     * @return string Greeting message with users name.
     */

    public function test($uid)
    {
return $uid;
}

and My Interface like

/**
     * Returns greeting message to user
     *
     * @api
     * @param int $uid.
     * @return string Greeting message with users name.
     */
    public function test($uid);

In webApi.xml

 <route url="/V1/XXX/uid/:id" method="GET">
            <service class="XXX\XXX\Api\XApiInterface" method="XXX"/>
            <resources>
                <resource ref="anonymous"/>
            </resources>
        </route> 

Answer 1

You have to changes parameter url="/V1/XXX/uid/:id" to url="/V1/XXX/uid/:uid" as, your parameters name is uid at test($uid)