How to use the oauth/oauth_error.OAuthUnauthorizedError function in oauth

self.provider.previousRequestToken(requestParameters['oauth_consumer_key'], function(err, result) {
              if(err) {
                callback(new errors.OAuthUnauthorizedError("Invalid / expired Token"), null);
              } else {
                // If we have a user for this consumer key let's calculate the signature
                var calculatedSignature = self.calculateSignature(method, protocol, url, path, requestParameters, tokenObject.token_secret, user.secret);
                // Check if the signature is correct and return a access token
                if(calculatedSignature == requestParameters.oauth_signature || self.calculateSignatureGoogleWay(method, protocol, url, path, requestParameters, tokenObject.token_secret, user.secret) == requestParameters.oauth_signature) {
                  self.provider.generateAccessToken(requestParameters['oauth_token'], function(err, result) {
                    if(result.access_token == null || result.token_secret == null) { callback(new errors.OAuthProviderError("generateAccessToken must return a object with fields [access_token, token_secret]"), null); return; }
                    callback(null, result);
                  });
                } else {
                  callback(new errors.OAuthUnauthorizedError("Invalid signature"), null);
                }
              }
            });                  
          } else {

self.provider.validateNotReplay(requestParameters.oauth_token, requestParameters.oauth_timestamp, requestParameters.oauth_nonce, function(err, result) {
        if(err) {
          callback(new errors.OAuthUnauthorizedError('Invalid / used nonce'), null);
        } else {
          self.provider.applicationByConsumerKey(token.consumer_key, function(err, user) {
            if(user.consumer_key == null || user.secret == null) { callback(new errors.OAuthProviderError("provider: applicationByConsumerKey must return a object with fields [token, secret]"), null); return;}
            // If we have a user for this consumer key let's calculate the signature
            var calculatedSignature = self.calculateSignature(method, protocol, url, path, requestParameters, token.token_secret, user.secret);            
            // Check if the signature is correct and return a access token
            if(calculatedSignature == requestParameters.oauth_signature || self.calculateSignatureGoogleWay(method, protocol, url, path, requestParameters, token.token_secret, user.secret) == requestParameters.oauth_signature) {
              // Fetch the user id to pass back
              self.provider.userIdByToken(requestParameters.oauth_token, function(err, doc) {
                if(doc.id == null) { callback(new errors.OAuthProviderError("provider: userIdByToken must return a object with fields [id]"), null); return;}
                // Return the user id to the calling function
                callback(null, doc);                
              });
            } else {
              callback(new errors.OAuthBadRequestError("Invalid signature"), null);
            }

self.provider.previousRequestToken(requestParameters['oauth_consumer_key'], function(err, result) {
              if(err) {
                callback(new errors.OAuthUnauthorizedError("Invalid / expired Token"), null);
              } else {
                // If we have a user for this consumer key let's calculate the signature
                var calculatedSignature = self.calculateSignature(method, protocol, url, path, requestParameters, tokenObject.token_secret, user.secret);
                // Check if the signature is correct and return a access token
                if(calculatedSignature == requestParameters.oauth_signature || self.calculateSignatureGoogleWay(method, protocol, url, path, requestParameters, tokenObject.token_secret, user.secret) == requestParameters.oauth_signature) {
                  self.provider.generateAccessToken(requestParameters['oauth_token'], function(err, result) {
                    if(result.access_token == null || result.token_secret == null) { callback(new errors.OAuthProviderError("generateAccessToken must return a object with fields [access_token, token_secret]"), null); return; }
                    callback(null, result);
                  });
                } else {
                  callback(new errors.OAuthUnauthorizedError("Invalid signature"), null);
                }
              }
            });                  
          } else {