code 1006 error

[angel7978]

index.js 실행 후 강제 종료 - > 재 실행 시에

caver.rpc.klay.subscribe 에서 code 1006 에러가 발생하고
websocket 연결이 되지 않습니다

caver.rpc.klay.subscribe에 대한 기술자료를 찾기가 힘든데
1006 에러에 대한 대응 방법이나 봇 정상적인 종료를 위한 방법이 있다면 코멘트 부탁드립니다!

Error: connection not open on send()
at Object.ConnectionNotOpenError (C:\workspace\arbitrage_trading_flash_klay\node_modules\caver-js\packages\caver-core-helpers\src\errors.js:69:23)
at C:\workspace\arbitrage_trading_flash_klay\node_modules\caver-js\packages\caver-core-requestmanager\caver-providers-ws\src\index.js:184:37
at Map.forEach ()
at WebsocketProvider._onClose (C:\workspace\arbitrage_trading_flash_klay\node_modules\caver-js\packages\caver-core-requestmanager\caver-providers-ws\src\index.js:183:27)
at W3CWebSocket._dispatchEvent [as dispatchEvent] (C:\workspace\arbitrage_trading_flash_klay\node_modules\yaeti\lib\EventTarget.js:115:12)
at W3CWebSocket.onConnectFailed (C:\workspace\arbitrage_trading_flash_klay\node_modules\websocket\lib\W3CWebSocket.js:219:14)
at WebSocketClient. (C:\workspace\arbitrage_trading_flash_klay\node_modules\websocket\lib\W3CWebSocket.js:59:25)
at WebSocketClient.emit (node:events:390:28)
at WebSocketClient.failHandshake (C:\workspace\arbitrage_trading_flash_klay\node_modules\websocket\lib\WebSocketClient.js:339:10)
at ClientRequest. (C:\workspace\arbitrage_trading_flash_klay\node_modules\websocket\lib\WebSocketClient.js:278:18) {
code: 1006,
reason: 'connection failed'
}