Unable to migrate NodeBB to another server

[brownsmart]

When trying to boot NodeBB on new server i get

at Function.MongoError.create (/home/***/nodebb/node_modules/mongodb/node_modules/mongodb-core/lib/error.js:31:11)
at /home/***/nodebb/node_modules/mongodb/node_modules/mongodb-core/lib/topologies/server.js:754:66
at Callbacks.emit (/home/***/nodebb/node_modules/mongodb/node_modules/mongodb-core/lib/topologies/server.js:95:3)
at null.messageHandler (/home/***/nodebb/node_modules/mongodb/node_modules/mongodb-core/lib/topologies/server.js:243:23)
at Socket.<anonymous> (/home/***/nodebb/node_modules/mongodb/node_modules/mongodb-core/lib/connection/connection.js:262:22)
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)

Any tips on best practices for migrating servers?