Invalid qos vector error

[marqueeeeeee]

{"pid":8616,"hostname":"IPGMKTHBV1","name":"mosca","level":40,"time":14889390745 50,"msg":"Invalid qos vector","type":"Error","stack":"Error: Invalid qos vector\ n at suback (C:\\Velocity\\Installed\\Mosca MQTT\\node_modules\\mqtt-packet\\ generate.js:400:11)\n at generate (C:\\Velocity\\Installed\\Mosca MQTT\\node_ modules\\mqtt-packet\\generate.js:25:14)\n at DestroyableTransform.process [a s _transform] (C:\\Velocity\\Installed\\Mosca MQTT\\node_modules\\mqtt-connectio n\\lib\\generateStream.js:13:16)\n at DestroyableTransform.Transform._read (C :\\Velocity\\Installed\\Mosca MQTT\\node_modules\\mqtt-connection\\node_modules\ \readable-stream\\lib\\_stream_transform.js:184:10)\n at DestroyableTransform .Transform._write (C:\\Velocity\\Installed\\Mosca MQTT\\node_modules\\mqtt-conne ction\\node_modules\\readable-stream\\lib\\_stream_transform.js:172:12)\n at doWrite (C:\\Velocity\\Installed\\Mosca MQTT\\node_modules\\mqtt-connection\\nod e_modules\\readable-stream\\lib\\_stream_writable.js:237:10)\n at writeOrBuff er (C:\\Velocity\\Installed\\Mosca MQTT\\node_modules\\mqtt-connection\\node_mod ules\\readable-stream\\lib\\_stream_writable.js:227:5)\n at DestroyableTransf orm.Writable.write (C:\\Velocity\\Installed\\Mosca MQTT\\node_modules\\mqtt-conn ection\\node_modules\\readable-stream\\lib\\_stream_writable.js:194:11)\n at Connection.callWrite3Args [as _callWrite] (C:\\Velocity\\Installed\\Mosca MQTT\\ node_modules\\reduplexer\\index.js:50:25)\n at Connection.write [as _write] ( C:\\Velocity\\Installed\\Mosca MQTT\\node_modules\\reduplexer\\index.js:147:17)\ n at doWrite (C:\\Velocity\\Installed\\Mosca MQTT\\node_modules\\reduplexer\\ node_modules\\readable-stream\\lib\\_stream_writable.js:237:10)\n at writeOrB uffer (C:\\Velocity\\Installed\\Mosca MQTT\\node_modules\\reduplexer\\node_modul es\\readable-stream\\lib\\_stream_writable.js:227:5)\n at Connection.Writable .write (C:\\Velocity\\Installed\\Mosca MQTT\\node_modules\\reduplexer\\node_modu les\\readable-stream\\lib\\_stream_writable.js:194:11)\n at Connection.(anony mous function) [as suback] (C:\\Velocity\\Installed\\Mosca MQTT\\node_modules\\m qtt-connection\\connection.js:64:12)\n at Client.<anonymous> (C:\\Velocity\\I nstalled\\Mosca MQTT\\node_modules\\mosca\\lib\\client.js:510:23)\n at Result sHolder.release (C:\\Velocity\\Installed\\Mosca MQTT\\node_modules\\fastparallel \\parallel.js:183:12)\n at parallel (C:\\Velocity\\Installed\\Mosca MQTT\\nod e_modules\\fastparallel\\parallel.js:39:16)\n at Object.map (C:\\Velocity\\In stalled\\Mosca MQTT\\node_modules\\steed\\steed.js:57:5)\n at Client.handleSu bscribe (C:\\Velocity\\Installed\\Mosca MQTT\\node_modules\\mosca\\lib\\client.j s:491:9)\n at Connection.<anonymous> (C:\\Velocity\\Installed\\Mosca MQTT\\no de_modules\\mosca\\lib\\client.js:101:12)\n at emitOne (events.js:96:13)\n at Connection.emit (events.js:188:7)","client":"2546844d-f67d-46cc-9fa6-3ab02f1 03747","v":1}

I'm having some issues about client disconnecting and reconnecting frequently. what does the invalid qos vector means? is one of the client using an invalid qos ?

[marqueeeeeee]

found the error in the client. it's subscribing to a null topic.