Cura: 'NoneType' object has no attribute 'findChild'

[jianqingHuang]

Application Version

Platform

ubuntu16.06 x86
Printer

Steps to Reproduce

Actual Results

Expected results

Traceback (most recent call last):
File "/root/uranui/UM/Qt/Bindings/MainWindow.py", line 78, in __init__
Application.getInstance().setMainWindow(self)
File "/root/uranui/UM/Qt/QtApplication.py", line 384, in setMainWindow
self.mainWindowChanged.emit()
File "/root/uranui/UM/Signal.py", line 212, in emit
self.__performEmit(args, kwargs)
File "/root/uranui/UM/Signal.py", line 315, in __performEmit
func(dest, *args, *kwargs)
File "/root/curaui/cura/../plugins/PostProcessingPlugin/PostProcessingPlugin.py", line 266, in _createView
Application.getInstance().addAdditionalComponent("saveButton", self._view.findChild(QObject, "postProcessingSaveAreaButton"))
AttributeError: 'NoneType' object has no attribute 'findChild'
**Additional Information

[LipuFei]

Hi @jianqingHuang , could you provide reproduce steps for this? Thank you.

[jianqingHuang]

Hello @LipuFei :
I compiled according to the steps of https://github.com/Ultimaker/Cura/wiki/Running-Cura-from-Source-on-Ubuntu
and this is the version information of the dependent library
cura version:master
Platform:linux-4.13.0-36-gneric-i686-with-ubuntu-16.04-xenial
Qt version:5.5.1
PyQt version:5.8.2
OpenGL:not yes initialized
python3:3.5.2
sip:4.19.2
libprotoc:3.5.1
QMake version 3.0
cmake version 3.5.1

Error traceback

Traceback (most recent call last):
File "/root/uranui/UM/Qt/Bindings/MainWindow.py", line 78, in __init__
Application.getInstance().setMainWindow(self)
File "/root/uranui/UM/Qt/QtApplication.py", line 384, in setMainWindow
self.mainWindowChanged.emit()
File "/root/uranui/UM/Signal.py", line 212, in emit
self.__performEmit(args, *kwargs)
File "/root/uranui/UM/Signal.py", line 315, in __performEmit
func(dest, args, *kwargs)
File "/root/curaui/cura/../plugins/PostProcessingPlugin/PostProcessingPlugin.py", line 266, in _createView
Application.getInstance().addAdditionalComponent("saveButton", self._view.findChild(QObject, "postProcessingSaveAreaButton"))
AttributeError: 'NoneType' object has no attribute 'findChild'

Logs

Thread 0xa4185b40 (most recent call first):
File "/root/uranui/UM/Backend/Backend.py", line 160 in _storeStderrToLogThread
File "/usr/lib/python3.5/threading.py", line 862 in run
File "/usr/lib/python3.5/threading.py", line 914 in _bootstrap_inner
File "/usr/lib/python3.5/threading.py", line 882 in _bootstrap

Thread 0xa4986b40 (most recent call first):
File "/root/uranui/UM/Backend/Backend.py", line 152 in _storeOutputToLogThread
File "/usr/lib/python3.5/threading.py", line 862 in run
File "/usr/lib/python3.5/threading.py", line 914 in _bootstrap_inner
File "/usr/lib/python3.5/threading.py", line 882 in _bootstrap

Thread 0xa5ac3b40 (most recent call first):
File "/root/curaui/cura/../plugins/RemovableDriveOutputDevice/RemovableDrivePlugin.py", line 61 in _updateThread
File "/usr/lib/python3.5/threading.py", line 862 in run
File "/usr/lib/python3.5/threading.py", line 914 in _bootstrap_inner
File "/usr/lib/python3.5/threading.py", line 882 in _bootstrap

Thread 0xacce2b40 (most recent call first):
File "/usr/lib/python3.5/threading.py", line 293 in wait
File "/usr/lib/python3.5/threading.py", line 424 in acquire
File "/root/uranui/UM/JobQueue.py", line 86 in _nextJob
File "/root/uranui/UM/JobQueue.py", line 112 in run
File "/usr/lib/python3.5/threading.py", line 914 in _bootstrap_inner
File "/usr/lib/python3.5/threading.py", line 882 in _bootstrap

Current thread 0xb7c5a980 (most recent call first):
File "/root/curaui/cura/CrashHandler.py", line 310 in _logInfoWidget
File "/root/curaui/cura/CrashHandler.py", line 160 in _createDialog
File "/root/curaui/cura/CrashHandler.py", line 81 in __init__
File "cura_app.py", line 104 in exceptHook
File "/root/uranui/UM/Qt/QtApplication.py", line 260 in initializeEngine
File "/root/curaui/cura/CuraApplication.py", line 796 in runWithGUI
File "/root/curaui/cura/CuraApplication.py", line 720 in run
File "cura_app.py", line 137 in

[LipuFei]

@jianqingHuang We have switched to PyQt 5.10 with Qt 5.10.1 for our master branch to get a few bug fixes. Your PyQt 5.8.2 probably won't work in this case. Since your Qt version 5.5.1 is also outdated, I would suggest to install PyQt 5.10 directly via pip, for example, with command pip install PyQt5==5.10 and try again.

[LipuFei]

I have also updated the wiki page.

[ChrisTerBeke]

I had the same issue and after installing qt 5.10 it worked fine again.

[jianqingHuang]

think you very much @LipuFei @ChrisTerBeke 👍
This error has disappeared，and it worked fine 👍
but I have a question ,as the picture shows, the material is empty ,When I modified display name, the interface crashed.
log 👍
2018-07-19 09:15:01,470 - CRITICAL - [MainThread] cura.CrashHandler.__init__ [65]: An uncaught error has occurred!
2018-07-19 09:15:01,470 - CRITICAL - [MainThread] cura.CrashHandler.__init__ [68]: Traceback (most recent call last):
2018-07-19 09:15:01,470 - CRITICAL - [MainThread] cura.CrashHandler.__init__ [68]: File "/root/Cura/cura/Machines/MaterialManager.py", line 454, in setMaterialName
2018-07-19 09:15:01,471 - CRITICAL - [MainThread] cura.CrashHandler.__init__ [68]: root_material_id = material_node.getMetaDataEntry("base_file")
2018-07-19 09:15:01,471 - CRITICAL - [MainThread] cura.CrashHandler.__init__ [68]: AttributeError: 'NoneType' object has no attribute 'getMetaDataEntry'

picture :