i am anable to get access token please help me ..

[vslambade]

http://localhost:9191/api/oauth/token?username=admin&password=admin&grant_type=password

when i hit this i get response
{
"error": "unauthorized",
"error_description": "Full authentication is required to access this resource"
}

please solve my problem

[sagarsumit03]

goto Authorization in Postman and select basic Auth and then use authentication.oauth.clientid as username and secret as password.