How to get USER ROLE information

Hello Experts
i’m trying to get user role information based on user id.
i got user id information from all_user() API call.
Same user id i’m passing to user_role information, but i’m getting below message.
{
“message”: “Not found”,
“documentation_url”: “http://docs.looker.com/
}

Please correct me if i’m going in wrong direction.

Regards,
Ajay

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