Failed to open serial port /dev/ttyUSB0 due to error: + TypeError: Cannot read property 'close' of null

[meier99]

Issue Type: Bug

Always happens on 'Arduino: Open Serial Monitor'.

Upload of sketch (Arduino: Upload) to board via /dev/ttyUSB0 works.
Serial Monitor started via Arduino application also works fine.

Extension version: 0.2.25
VS Code version: Code 1.31.0 (7c66f58312b48ed8ca4e387ebd9ffe9605332caa, 2019-02-05T22:32:48.719Z)
OS version: Linux ia32 4.15.0-45-generic

System Info

Item	Value
CPUs	Intel(R) Core(TM) i3-2330M CPU @ 2.20GHz (4 x 1167)
GPU Status	2d_canvas: enabled checker_imaging: disabled_off flash_3d: enabled flash_stage3d: enabled flash_stage3d_baseline: enabled gpu_compositing: enabled multiple_raster_threads: enabled_on native_gpu_memory_buffers: disabled_software rasterization: disabled_software surface_synchronization: enabled_on video_decode: unavailable_off webgl: enabled webgl2: enabled
Load (avg)	0, 0, 0
Memory (System)	3.89GB (0.60GB free)
Process Argv	--unity-launch
Screen Reader	no
VM	0%

[czgtest]

I will investigate with it.

[stale]

This issue has been automatically marked as stale and closed because it has not had recent activity. Please feel free to open a new issue if you would like further discussion. Thank you for your contributions.

[edalongeville]

Hello,

I am facing the same problem on Manjaro 18, running extension version 0.2.25, VSCode 1.33.1 and arduino 1.8.9.

"Arduino: Upload" works perfectly, but opening the serial port causes the following error:

Failed to open serial port /dev/ttyUSB0 due to error: + TypeError: Cannot read property 'close' of null

This is not a permission issue. I put my ttyUSB0 ad chmod 777 to troubleshoot, the problem is still here.
Using the same software versions, it works on my Ubuntu 18.04 Laptop.

Here's what the developer tools gave me:

console.ts:134 [Extension Host] [Warn] no library available after trying files (16) ["/home/eric/.vscode-oss/extensions/vsciot-vscode.vs…ative/lib/native/usb-native_darwin_1.4.6_x64.node", "/home/eric/.vscode-oss/extensions/vsciot-vscode.vs…ative/lib/native/usb-native_darwin_1.6.6_x64.node", "/home/eric/.vscode-oss/extensions/vsciot-vscode.vs…ative/lib/native/usb-native_darwin_1.7.3_x64.node", "/home/eric/.vscode-oss/extensions/vsciot-vscode.vs…ative/lib/native/usb-native_darwin_2.0.2_x64.node", "/home/eric/.vscode-oss/extensions/vsciot-vscode.vs…tive/lib/native/usb-native_darwin_3.0.10_x64.node", "/home/eric/.vscode-oss/extensions/vsciot-vscode.vs…/lib/native/usb-native_Ubuntu14.04_1.4.6_x64.node", "/home/eric/.vscode-oss/extensions/vsciot-vscode.vs…/lib/native/usb-native_Ubuntu14.04_1.6.6_x64.node", "/home/eric/.vscode-oss/extensions/vsciot-vscode.vs…/lib/native/usb-native_Ubuntu14.04_1.7.3_x64.node", "/home/eric/.vscode-oss/extensions/vsciot-vscode.vs…/lib/native/usb-native_Ubuntu14.04_2.0.2_x64.node", "/home/eric/.vscode-oss/extensions/vsciot-vscode.vs…lib/native/usb-native_Ubuntu14.04_3.0.10_x64.node", "/home/eric/.vscode-oss/extensions/vsciot-vscode.vs…native/lib/native/usb-native_win32_1.4.6_x64.node", "/home/eric/.vscode-oss/extensions/vsciot-vscode.vs…native/lib/native/usb-native_win32_1.4.7_x64.node", "/home/eric/.vscode-oss/extensions/vsciot-vscode.vs…native/lib/native/usb-native_win32_1.6.6_x64.node", "/home/eric/.vscode-oss/extensions/vsciot-vscode.vs…native/lib/native/usb-native_win32_1.7.3_x64.node", "/home/eric/.vscode-oss/extensions/vsciot-vscode.vs…native/lib/native/usb-native_win32_2.0.2_x64.node", "/home/eric/.vscode-oss/extensions/vsciot-vscode.vs…ative/lib/native/usb-native_win32_3.0.10_x64.node"]
console.ts:134 [Extension Host] ApplicationInsights:Sender [{…}]
t.log @ console.ts:134
$logExtensionHostMessage @ mainThreadConsole.ts:39
_doInvokeHandler @ rpcProtocol.ts:399
_invokeHandler @ rpcProtocol.ts:384
_receiveRequest @ rpcProtocol.ts:304
_receiveOneMessage @ rpcProtocol.ts:226
_protocol.onMessage.e @ rpcProtocol.ts:101
fire @ event.ts:584
a @ ipc.net.ts:392
e @ ipc.net.ts:399
fire @ event.ts:584
_receiveMessage @ ipc.net.ts:678
_socketDisposables.push._socketReader.onMessage.e @ ipc.net.ts:549
fire @ event.ts:584
acceptChunk @ ipc.net.ts:212
_register._socket.onData.e @ ipc.net.ts:173
t @ ipc.net.ts:24
emit @ events.js:182
addChunk @ _stream_readable.js:283
readableAddChunk @ _stream_readable.js:264
Readable.push @ _stream_readable.js:219
onStreamRead @ internal/stream_base_commons.js:94

The non-abreviated path is:

"/home/eric/.vscode-oss/extensions/vsciot-vscode.vscode-arduino-0.2.25/vendor/node-usb-native/lib/native/"

[pg1992]

I'm having the same issue. When I try to run F1 Arduino: Open Serial Monitor I get the warning

Failed to open serial port /dev/ttyUSB0 due to error: + TypeError: Cannot read property 'close' of null

Verify and upload run without any problems, and I can access the serial port running screen /dev/ttyUSB0 115200 on my terminal emulator.

If I run my project with code --verbose I get this in the output:

...
[17693:0428/103656.112433:INFO:CONSOLE(3214)] "[[object Object]]Cannot read property 'settings' of null", source: file:///usr/lib/code/out/vs/workbench/workbench.main.js (3214)
[17693:0428/103656.112481:INFO:CONSOLE(3214)] "TypeError: Cannot read property 'settings' of null
	at SerialMonitor.initialize (/home/espectro/.vscode-oss/extensions/vsciot-vscode.vscode-arduino-0.2.25/out/src/serialmonitor/serialMonitor.js:42:69)
	at constructor.dc.onDidChange (/home/espectro/.vscode-oss/extensions/vsciot-vscode.vscode-arduino-0.2.25/out/src/serialmonitor/serialMonitor.js:26:26)
	at u.fire (/usr/lib/code/out/vs/workbench/services/extensions/node/extensionHostProcess.js:44:708)
	at loadContext.vscode.workspace.findFiles.then (/home/espectro/.vscode-oss/extensions/vsciot-vscode.vscode-arduino-0.2.25/out/src/deviceContext.js:76:39)", source: file:///usr/lib/code/out/vs/workbench/workbench.main.js (3214)
...

---

I'm running it on

• Arch Linux
• code --list-extensions --show versions:

  dbaeumer.vscode-eslint@1.8.2
  donjayamanne.jquerysnippets@0.0.1
  dracula-theme.theme-dracula@2.17.0
  eamodio.gitlens@9.6.3
  esbenp.prettier-vscode@1.9.0
  mrmlnc.vscode-autoprefixer@2.2.0
  ms-python.python@2019.4.11987
  ms-vscode.cpptools@0.22.1
  PKief.material-icon-theme@3.7.0
  vsciot-vscode.vscode-arduino@0.2.25

• code --version:

  1.33.1
  51b0b28134d51361cf996d2f0a1c698247aeabd8
  x64

• uname -a:

  Linux arch-avell 5.0.8-arch1-1-ARCH #1 SMP PREEMPT Wed Apr 17 14:56:15 UTC 2019 x86_64 GNU/Linux

[hywhuangyuwei]

I have this problem too.
I am using Manjaro with Arduino IDE 1.8.9 and Verify & Upload also works perfectly.
Note: I noticed that when I click the select serial port there is no response and I had to write that to the arduino.json manually.

[Moonlight63]

@hywhuangyuwei Same problem here with no response clicking select serial port. In my case, uploading from arduino also did not work. I had to use sudo chmod a+rw /dev/ttyACM0 to upload anything.

[aboulfad]

Me too, just happened after VSCode updated itself to the latest June 2019 version ... I just reverted to May 2019, and the problem went away. It's clear something was broken in June 2019 version regarding this issue!

[dbaeumer]

Regarding @aboulfad comment above: See this comment here for why this fails right now: microsoft/vscode#76538 (comment)

[ArthurMa1978]

Fixed since Arduino extension v0.2.27, thanks @meier99 @edalongeville @pg1992 @hywhuangyuwei @Moonlight63 @aboulfad @dbaeumer .