その ip:port で実行されている mongo サーバー、サーバー、またはサービスはありませんが、この種のエラーはまだ発生しています。
(lockerdb) Database connection error: { [Error: failed to connect to [127.0.0.1:10004]]
[stack]: [Getter/Setter],
[message]: 'failed to connect to [127.0.0.1:10004]',
[arguments]: undefined,
[type]: undefined }
node.js:201
throw e; // process.nextTick error, or 'error' event on first tick
^
TypeError: Cannot call method 'close' of null
at /home/<user>/Documents/Server_v1/ssc/ssc-lac/lac-util.js:1653:15
at /home/<user>/node_modules/mongodb/lib/mongodb/db.js:247:16
at [object Object].<anonymous> (/home/<user>/node_modules/mongodb/lib/mongodb/connection/server.js:383:7)
at [object Object].emit (events.js:88:20)
at [object Object].<anonymous> (/home/<user>/node_modules/mongodb/lib/mongodb/connection/connection_pool.js:93:15)
at [object Object].emit (events.js:70:17)
at Socket.<anonymous> (/home/<user>/node_modules/mongodb/lib/mongodb/connection/connection.js:385:10)
at Socket.emit (events.js:67:17)
at Array.0 (net.js:319:25)
at EventEmitter._tickCallback (node.js:192:41)
このエラーの原因は何ですか?