Error Tweet namespace not found

Hi

I have installed TweetInviApi  by Linvi, but i am not able to access AUTH, Upload

I am getting error TweetInvi namespace not found.

Getting error Tweet namespace not found

Upload namespace not found

Auth(oauth_consumer_key, oauth_consumer_secret, accessToken, accessTokenSecret);

// Upload video (Replace "videoPath" with the path to your video file)
var videoUploadResult = Upload.UploadVideo(videoPath);

// Post video
var tweet = Tweetinvi.Tweet.PublishTweet("Check out my video!", new PublishTweetOptionalParameters
{
    Medias = { videoUploadResult },
});

Thanks