Error guestsarenotallowed on call core_user_view_user_profile bay API REST

Hello

I a have an error message :

first I get Token from ;

GET https://mymoodle.com/login/token.php?username=myuser&password=mypassword&service=moodle_mobile_app

but when I call :

https://mymoodle.com/webservice/rest/server.php?moodlewsrestformat=json&wstoken=mytoken&wsfunction=core_user_view_user_profile&userid=myuserid

I got :

{

  "exception": "moodle_exception",

  "errorcode": "guestsarenotallowed",

  "message": "Les visiteurs anonymes ne peuvent pas faire ceci"

}

any Ideas ? thanks !