Callback is not a function #2043

Issue Description

I am trying to get a list of AccessTokens, and using these to get a list of Twitter followers who are also my app users. But I keep getting this error "verbose: error: MongoError: TypeError: callback is not a function". What am I doing wrong?

Copying the code:
return accessTokenQuery.find({ useMasterKey: true })
.then(function(targetAccessTokens){
if(targetAccessTokens==undefined){
return Parse.Promise.as();
}
var twitterIds = "";
var addComma = false;
var idMap = [];
for(var i=0; i< targetAccessTokens.length; i++){
twitterIds += (addComma? ",": "") + targetAccessTokens[i].get("twitterId");
idMap[targetAccessTokens[i].get("twitterId")] = targetAccessTokens[i];
addComma = true;
}
return postsJS.getTwitterUserFriendsLookupPromise(twitterIds, config, sourceAccessToken, twitterSecretKey)
.then(function(response){
if(response==undefined || response.data==undefined){
return Parse.Promise.error(response);
}

        for(var i=0; i<response.data.length; i++){
            var relationship = response.data[i];
            var targetAccessToken = idMap[relationship.id_str];
            if(targetAccessToken != undefined && relationship.connections!=undefined 
                && relationship.connections.indexOf("followed_by")> -1){                    
                relation.add(targetAccessToken.get("createdFor"));
            }
        }
        userDetails.set("friendsLastUpdatedAt", new Date());
        userDetails.set("isTriggerUpdate", true);
        return userDetails.save(null, { useMasterKey: true})
        .then(function(){
            return Parse.Promise.as();
        }, function(error){
            winstonJS.logger.error("Error (Suppressed) saving friend details for userDetails" + userDetails.id + ". Error " + JSON.stringify(error, null, 4));
            return Parse.Promise.as("Error (Suppressed) saving user details for " + userDetails.id);        
        });

    }, function(error){
        winstonJS.logger.error("Error (suppressed) processing twitter users " + sourceAccessToken.id + " and " + twitterIds 
            +".  Error " + JSON.stringify(error, null, 4));
        return Parse.Promise.as("Error (suppressed) processing twitter users " + sourceAccessToken.id + " and " + twitterIds);      
    });
})
.then(function(){
    return Parse.Promise.as();
}, function(error){
    winstonJS.logger.error("Error processing twitter users " + sourceAccessToken.id + ".  Error " + JSON.stringify(error, null, 4));
    return Parse.Promise.error("Processing twitter users " + sourceAccessToken.id);     
});

Logs/Trace

verbose: GET /parse/classes/UserAccessToken { 'user-agent': 'node-XMLHttpRequest, Parse/js1.8.5 (NodeJS 4.3.0)',
accept: '/',
'content-type': 'text/plain',
host: 'localhost:1337',
'content-length': '442',
connection: 'close' } {
"where": {
"createdFor": {
"$inQuery": {
"where": {
"status": {
"$in": [
"Active",
"Inactive"
]
}
},
"className": "_User"
}
},
"activeSocialLink": 3,
"objectId": {
"$ne": "bohjnw1kkj"
}
},
"limit": 100
}
verbose: error: MongoError: TypeError: callback is not a function
at null.messageHandler (D:\Work\ConradLabs\Doofl\doofl-parseserver\node_modules\parse-server\node_modules\mongodb\node_modules\mongodb-core\lib\topologies\server.js:399:39)
at Socket. (D:\Work\ConradLabs\Doofl\doofl-parseserver\node_modules\parse-server\node_modules\mongodb\node_modules\mongodb-core\lib\connection\connection.js:302:22)
at emitOne (events.js:77:13)
at Socket.emit (events.js:169:7)
at readableAddChunk (_stream_readable.js:146:16)
at Socket.Readable.push (_stream_readable.js:110:10)
at TCP.onread (net.js:523:20)
error: Uncaught internal server error. { [MongoError: TypeError: callback is not a function]
name: 'MongoError',
message: [TypeError: callback is not a function] } MongoError: TypeError: callback is not a function
at null.messageHandler (D:\Work\ConradLabs\Doofl\doofl-parseserver\node_modules\parse-server\node_modules\mongodb\node_modules\mongodb-core\lib\topologies\server.js:399:39)
at Socket. (D:\Work\ConradLabs\Doofl\doofl-parseserver\node_modules\parse-server\node_modules\mongodb\node_modules\mongodb-core\lib\connection\connection.js:302:22)
at emitOne (events.js:77:13)
at Socket.emit (events.js:169:7)
at readableAddChunk (_stream_readable.js:146:16)
at Socket.Readable.push (_stream_readable.js:110:10)
at TCP.onread (net.js:523:20)