Error: Error getting collection: sessions
    at /mnt/data/mih-todo-app/node_modules/connect-mongo/lib/connect-mongo.js:160:19
    at Db.collection (/mnt/data/mih-todo-app/node_modules/mongoose/node_modules/mongodb/lib/mongodb/db.js:526:27)
    at MongoStore._get_collection (/mnt/data/mih-todo-app/node_modules/connect-mongo/lib/connect-mongo.js:158:17)

    at MongoStore.get (/mnt/data/mih-todo-app/node_modules/connect-mongo/lib/connect-mongo.js:222:10)
    at session (/mnt/data/mih-todo-app/node_modules/express-session/index.js:367:11)
    at Layer.handle [as handle_request] (/mnt/data/mih-todo-app/node_modules/express/lib/router/layer.js:82:5)
    at trim_prefix (/mnt/data/mih-todo-app/node_modules/express/lib/router/index.js:269:13)
    at /mnt/data/mih-todo-app/node_modules/express/lib/router/index.js:236:9
    at Function.proto.process_params (/mnt/data/mih-todo-app/node_modules/express/lib/router/index.js:311:12)
    at /mnt/data/mih-todo-app/node_modules/express/lib/router/index.js:227:12
    at Function.match_layer (/mnt/data/mih-todo-app/node_modules/express/lib/router/index.js:294:3)
    at next (/mnt/data/mih-todo-app/node_modules/express/lib/router/index.js:188:10)
    at cookieParser (/mnt/data/mih-todo-app/node_modules/cookie-parser/index.js:48:5)
    at Layer.handle [as handle_request] (/mnt/data/mih-todo-app/node_modules/express/lib/router/layer.js:82:5)
    at trim_prefix (/mnt/data/mih-todo-app/node_modules/express/lib/router/index.js:269:13)
    at /mnt/data/mih-todo-app/node_modules/express/lib/router/index.js:236:9
GET / 500 19.108 ms - -
Error: Cannot determine state of server
    at canCheckoutReader (/mnt/data/mih-todo-app/node_modules/mongoose/node_modules/mongodb/lib/mongodb/connection/server.js:779:12)
    at Server.checkoutReader (/mnt/data/mih-todo-app/node_modules/mongoose/node_modules/mongodb/lib/mongodb/connection/server.js:793:16)
    at Cursor.nextObject (/mnt/data/mih-todo-app/node_modules/mongoose/node_modules/mongodb/lib/mongodb/cursor.js:748:48)
    at Collection.findOne (/mnt/data/mih-todo-app/node_modules/mongoose/node_modules/mongodb/lib/mongodb/collection/query.js:162:10)
    at /mnt/data/mih-todo-app/node_modules/connect-mongo/lib/connect-mongo.js:223:18
    at MongoStore._get_collection (/mnt/data/mih-todo-app/node_modules/connect-mongo/lib/connect-mongo.js:156:21)
    at MongoStore.get (/mnt/data/mih-todo-app/node_modules/connect-mongo/lib/connect-mongo.js:222:10)
    at session (/mnt/data/mih-todo-app/node_modules/express-session/index.js:367:11)
    at Layer.handle [as handle_request] (/mnt/data/mih-todo-app/node_modules/express/lib/router/layer.js:82:5)
    at trim_prefix (/mnt/data/mih-todo-app/node_modules/express/lib/router/index.js:269:13)
    at /mnt/data/mih-todo-app/node_modules/express/lib/router/index.js:236:9
    at Function.proto.process_params (/mnt/data/mih-todo-app/node_modules/express/lib/router/index.js:311:12)
    at /mnt/data/mih-todo-app/node_modules/express/lib/router/index.js:227:12
    at Function.match_layer (/mnt/data/mih-todo-app/node_modules/express/lib/router/index.js:294:3)
    at next (/mnt/data/mih-todo-app/node_modules/express/lib/router/index.js:188:10)
    at cookieParser (/mnt/data/mih-todo-app/node_modules/cookie-parser/index.js:48:5)
GET /favicon.ico 500 8.680 ms - -
^C