c:\Users\urielbertoche\Projects\betterchat-dotd\node_modules\mongoose\node_modules\mongodb\node_modules\mongodb-core\lib\topologies\server.js:796
      catch(err) { process.nextTick(function() { throw err}); }
                                                       ^
TypeError: undefined is not a function
    at c:\Users\urielbertoche\Projects\betterchat-dotd\node_modules\mongoose\node_modules\mongodb\lib\bulk\unordered.js:470:5
    at c:\Users\urielbertoche\Projects\betterchat-dotd\node_modules\mongoose\node_modules\mongodb\lib\bulk\unordered.js:424:9
    at resultHandler (c:\Users\urielbertoche\Projects\betterchat-dotd\node_modules\mongoose\node_modules\mongodb\lib\bulk\unordered.js:393:5)
    at c:\Users\urielbertoche\Projects\betterchat-dotd\node_modules\mongoose\node_modules\mongodb\node_modules\mongodb-core\lib\topologies\server.js:795:13
    at Callbacks.emit (c:\Users\urielbertoche\Projects\betterchat-dotd\node_modules\mongoose\node_modules\mongodb\node_modules\mongodb-core\lib\topologies\server.js:94:3)
    at null.messageHandler (c:\Users\urielbertoche\Projects\betterchat-dotd\node_modules\mongoose\node_modules\mongodb\node_modules\mongodb-core\lib\topologies\server.js:235:23)
    at Socket.<anonymous> (c:\Users\urielbertoche\Projects\betterchat-dotd\node_modules\mongoose\node_modules\mongodb\node_modules\mongodb-core\lib\connection\connection.js:259:22)
    at Socket.emit (events.js:107:17)
    at readableAddChunk (_stream_readable.js:163:16)
    at Socket.Readable.push (_stream_readable.js:126:10)
    at TCP.onread (net.js:538:20)

Process finished with exit code 1