/opt/chetbot/server/node_modules/express-ws/node_modules/ws/lib/WebSocket.js:181
else throw new Error('not opened');
^
Error: not opened
at WebSocket.send (/opt/chetbot/server/node_modules/express-ws/node_modules/ws/lib/WebSocket.js:181:16)
at WebSocket.<anonymous> (/opt/chetbot/server/websocket_server.js:75:18)
at emitTwo (events.js:87:13)
at WebSocket.emit (events.js:172:7)
at Receiver.self._receiver.ontext (/opt/chetbot/server/node_modules/express-ws/node_modules/ws/lib/WebSocket.js:682:10)
at Receiver.opcodes.1.finish (/opt/chetbot/server/node_modules/express-ws/node_modules/ws/lib/Receiver.js:391:14)
at Receiver.expectHandler (/opt/chetbot/server/node_modules/express-ws/node_modules/ws/lib/Receiver.js:372:33)
at Receiver.add (/opt/chetbot/server/node_modules/express-ws/node_modules/ws/lib/Receiver.js:87:24)
at Socket.firstHandler (/opt/chetbot/server/node_modules/express-ws/node_modules/ws/lib/WebSocket.js:663:22)
at emitOne (events.js:77:13)
at Socket.emit (events.js:169:7)
at readableAddChunk (_stream_readable.js:146:16)
at Socket.Readable.push (_stream_readable.js:110:10)
at TCP.onread (net.js:523:20)