Error message "Could not authenticate you" with code 32 when calling twitter API?

When calling this api: https://api.twitter.com/1.1/followers/list.json?amp%3Binclude_user_entities=false&amp%3Bscreen_name=twitterdev&amp%3Bskip_status=true&cursor=-1

with the following Authorization:

OAuth oauth_consumer_key="XXXXXXXXXXXXXXXXXXXXXXXXX", oauth_nonce="0ddddff20481ae3567739f4eefa49b22", oauth_signature="7DQKPmbqJAzRh%2FM0UTB2w82lGvY%3D", oauth_signature_method="HMAC-SHA1", oauth_timestamp="1468795885", oauth_token="XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX", oauth_version="1.0" 

to get my followers list from twitter, I get the json object of my followers successfully, but when replacing the value of the screen_name (parameter passed with the top api) from twitterdev to my actual screen_name's value, I get this error:

{
"errors": [
    {
        "code": 32,
        "message": "Could not authenticate you."
    }
]

}

Please, Can any one help me to solve this problem ?