Cannot read property "Threads" of null

[DonJayamanne]

From @thynquest on August 6, 2017 11:58

Environment data

VS Code version: 1.14.2
Python Extension version: 0.7.0
Python Version: 3.5
OS and version: Ubuntu 16.04

Actual behavior

when I try to debug a simple python code using the python interpreter of my virtual environment the debugger does not stop

Expected behavior

the debugger should stop on the debug point

Steps to reproduce:

• create a virtual environment
• launch vscode from this virtual environment and set the "python.pythonPath" property to your python interpreter defined in your virtual environment
• create a launch.json file in order to debug
• set debug point on your python file and lauch the debug

Logs

Output from Console window (Help->Developer Tools menu)
shell.ts:443 TypeError: Cannot read property 'Threads' of null
at PythonDebugger.threadsRequest (/home/skullalive/.vscode/extensions/donjayamanne.python-0.7.0/out/client/debugger/Main.js:364:27)
at PythonDebugger.DebugSession.dispatchRequest (/home/skullalive/.vscode/extensions/donjayamanne.python-0.7.0/node_modules/vscode-debugadapter/lib/debugSession.js:427:22)
at PythonDebugger.ProtocolServer._handleData (/home/skullalive/.vscode/extensions/donjayamanne.python-0.7.0/node_modules/vscode-debugadapter/lib/protocol.js:104:38)
at Socket. (/home/skullalive/.vscode/extensions/donjayamanne.python-0.7.0/node_modules/vscode-debugadapter/lib/protocol.js:24:60)
at emitOne (events.js:96:13)
at Socket.emit (events.js:188:7)
at readableAddChunk (_stream_readable.js:176:18)
at Socket.Readable.push (_stream_readable.js:134:10)
at Pipe.onread (net.js:551:20) : Error: TypeError: Cannot read property 'Threads' of null
at PythonDebugger.threadsRequest (/home/skullalive/.vscode/extensions/donjayamanne.python-0.7.0/out/client/debugger/Main.js:364:27)
at PythonDebugger.DebugSession.dispatchRequest (/home/skullalive/.vscode/extensions/donjayamanne.python-0.7.0/node_modules/vscode-debugadapter/lib/debugSession.js:427:22)
at PythonDebugger.ProtocolServer._handleData (/home/skullalive/.vscode/extensions/donjayamanne.python-0.7.0/node_modules/vscode-debugadapter/lib/protocol.js:104:38)
at Socket. (/home/skullalive/.vscode/extensions/donjayamanne.python-0.7.0/node_modules/vscode-debugadapter/lib/protocol.js:24:60)
at emitOne (events.js:96:13)
at Socket.emit (events.js:188:7)
at readableAddChunk (_stream_readable.js:176:18)
at Socket.Readable.push (_stream_readable.js:134:10)
at Pipe.onread (net.js:551:20)
at file:///usr/share/code/resources/app/out/vs/workbench/electron-browser/workbench.main.js:28:2184338
at Object.v [as _notify] (file:///usr/share/code/resources/app/out/vs/workbench/electron-browser/workbench.main.js:28:53344)
at Object.enter (file:///usr/share/code/resources/app/out/vs/workbench/electron-browser/workbench.main.js:28:56836)
at n.Class.derive._oncancel._run (file:///usr/share/code/resources/app/out/vs/workbench/electron-browser/workbench.main.js:28:58157)
at n.Class.derive._oncancel._error (file:///usr/share/code/resources/app/out/vs/workbench/electron-browser/workbench.main.js:28:57674)
at file:///usr/share/code/resources/app/out/vs/workbench/electron-browser/workbench.main.js:28:1972432
at g.e.dispatch (file:///usr/share/code/resources/app/out/vs/workbench/electron-browser/workbench.main.js:28:1973783)
at g.e.handleData (file:///usr/share/code/resources/app/out/vs/workbench/electron-browser/workbench.main.js:28:1973291)
at Socket. (file:///usr/share/code/resources/app/out/vs/workbench/electron-browser/workbench.main.js:28:1972292)
at emitOne (events.js:96:13)
at Socket.emit (events.js:188:7)
e.onUnexpectedError @ shell.ts:443
(anonymous) @ shell.ts:403
e.onUnexpectedError @ errors.ts:119
o @ errors.ts:139
done @ winjs.base.raw.js:1378
v @ winjs.base.raw.js:1224
enter @ winjs.base.raw.js:901
_run @ winjs.base.raw.js:1068
_chainedError @ winjs.base.raw.js:1031
n @ winjs.base.raw.js:736
then @ winjs.base.raw.js:1436
enter @ winjs.base.raw.js:747
_run @ winjs.base.raw.js:1068
_setCompleteValue @ winjs.base.raw.js:1052
v @ winjs.base.raw.js:1209
enter @ winjs.base.raw.js:901
_run @ winjs.base.raw.js:1068
_error @ winjs.base.raw.js:1041
(anonymous) @ v8Protocol.ts:53
e.dispatch @ v8Protocol.ts:136
e.handleData @ v8Protocol.ts:104
(anonymous) @ v8Protocol.ts:41
emitOne @ events.js:96
emit @ events.js:188
readableAddChunk @ _stream_readable.js:176
Readable.push @ _stream_readable.js:134
onread @ net.js:551
index.js:41 [uncaught exception]: Error: write EPIPE
onError @ index.js:41
(anonymous) @ index.js:110
emitOne @ events.js:96
emit @ events.js:188
window.onerror @ /usr/share/code/resources/electron.asar/renderer/init.js:124
i.globals.onerror @ errorTelemetry.ts:64
index.js:44 Error: write EPIPE
at exports._errnoException (util.js:1022)
at WriteWrap.afterWrite [as oncomplete] (net.js:804)
onError @ index.js:44
(anonymous) @ index.js:110
emitOne @ events.js:96
emit @ events.js:188
window.onerror @ /usr/share/code/resources/electron.asar/renderer/init.js:124
i.globals.onerror @ errorTelemetry.ts:64
events.js:160 Uncaught Error: write EPIPE
at exports._errnoException (util.js:1022)
at WriteWrap.afterWrite [as oncomplete] (net.js:804)
exports._errnoException @ util.js:1022
afterWrite @ net.js:804

Copied from original issue: DonJayamanne/pythonVSCode#1142

[DonJayamanne]

From @thynquest on August 6, 2017 12:9

here is the code I'm trying to debug with no success

import os

result = os.path.abspath(file)
x = os.path.dirname(result)
y = os.path.dirname(x)
print(result)
print(x)
print(y)

thank you for your help

[DonJayamanne]

From @thynquest on August 6, 2017 12:39

even a simpler line like "print("hello world")' does not work

[DonJayamanne]

Good new @thynquest I have managed to reproduce the same error using a different technique:

• Set interpreter to Python3
• Debug a python file with the code print "1234" (note parenthesis is missing)

I'll check if this can be reproduced on PTVS (Visual Studio).