cfclient cannot be used

[easy98]

Hello, I have installed cfclient before and it works perfectly. But today it is broken suddenly. I don't know what happen.
When I run the command "cfclient", I get the following issues:

INFO:main:Disabling STL printouts
INFO:cfclient.utils.input.inputreaders:Input readers: ['linuxjsdev', 'pysdl2']
INFO:cfclient.utils.input.inputreaders:Successfully initialized [linuxjsdev]
INFO:cfclient.utils.input.inputreaders:Could not initialize [pysdl2]: No SDL2 support on Linux
INFO:cfclient.utils.input.inputinterfaces:Found interfaces: ['leapmotion', 'wiimote', 'zmqpull']
INFO:cfclient.utils.input.inputinterfaces:Could not initialize [leapmotion]: Leap Motion library probably not installed (No module named 'leapsdk')
INFO:cfclient.utils.input.inputinterfaces:Could not initialize [wiimote]: Missing cwiid (wiimote) driver No module named 'cwiid'
INFO:cfclient.utils.config:Dist config read from /snap/cfclient/65/lib/python3.6/site-packages/cfclient/configs/config.json
INFO:cfclient.utils.config:Config file read from [/home/coven-lab/snap/cfclient/65/.config/cfclient/config.json]
INFO:cfclient.utils.input.inputinterfaces:Could not initialize [zmqpull]: ZMQ input disabled in config file
INFO:cfclient.utils.zmq_led_driver:ZMQ led disabled in config file
INFO:cfclient.utils.zmq_param:ZMQ param disabled in config file
Qt: Session management error: None of the authentication protocols specified are supported
INFO:cfclient.utils.input:Using device blacklist [(VirtualBox|VMware)]
INFO:cfclient.ui.main:Auto reconnect enabled: True
INFO:cflib.crtp.radiodriver:v99.55 dongle with serial N/A found
WARNING: could not determine DPI
WARNING:vispy:could not determine DPI
WARNING: Although PyQt5 is already imported, the PyQt5 backend could not
be used ("cannot import name 'QtOpenGL'").
Note that running multiple GUI toolkits simultaneously can cause side effects.
WARNING:vispy:Although PyQt5 is already imported, the PyQt5 backend could not
be used ("cannot import name 'QtOpenGL'").
Note that running multiple GUI toolkits simultaneously can cause side effects.
===== 2020.10.10 12:10:01 =====
Traceback (most recent call last):
File "/snap/cfclient/65/usr/lib/python3.6/runpy.py", line 193, in _run_module_as_main
"main", mod_spec)
File "/snap/cfclient/65/usr/lib/python3.6/runpy.py", line 85, in _run_code
exec(code, run_globals)
File "/snap/cfclient/65/lib/python3.6/site-packages/cfclient/gui.py", line 197, in
main()
File "/snap/cfclient/65/lib/python3.6/site-packages/cfclient/gui.py", line 189, in main
main_window = MainUI()
File "/snap/cfclient/65/lib/python3.6/site-packages/cfclient/ui/main.py", line 266, in init
tab = tabClass(self.tabs, cfclient.ui.pluginhelper)
File "/snap/cfclient/65/lib/python3.6/site-packages/cfclient/ui/tabs/locopositioning_tab.py", line 469, in init
self._set_up_plots()
File "/snap/cfclient/65/lib/python3.6/site-packages/cfclient/ui/tabs/locopositioning_tab.py", line 500, in _set_up_plots
self._plot_3d.native.setSizePolicy(sizePolicy)
AttributeError: 'CanvasBackend' object has no attribute 'setSizePolicy'
===== 2020.10.10 12:10:01 =====
Traceback (most recent call last):
File "/snap/cfclient/65/lib/python3.6/site-packages/cfclient/ui/main.py", line 837, in scan
self.interfaceFoundSignal.emit(cflib.crtp.scan_interfaces(address))
File "/snap/cfclient/65/lib/python3.6/site-packages/cflib/crtp/init.py", line 73, in scan_interfaces
found = instance.scan_interface(address)
File "/snap/cfclient/65/lib/python3.6/site-packages/cflib/crtp/radiodriver.py", line 361, in scan_interface
for c in self._scan_radio_channels(cradio)]
File "/snap/cfclient/65/lib/python3.6/site-packages/cflib/crtp/radiodriver.py", line 292, in _scan_radio_channels
return list(cradio.scan_channels(start, stop, (0xff,)))
File "/snap/cfclient/65/lib/python3.6/site-packages/cflib/drivers/crazyradio.py", line 275, in scan_channels
Qt has caught an exception thrown from an event handler. Throwing
exceptions from an event handler is not supported in Qt.
You must not let any exception whatsoever propagate through Qt code.
If that is not possible, in Qt 5 you must at least reimplement
QCoreApplication::notify() and catch all exceptions there.

(process:21041): GLib-CRITICAL **: 12:24:01.621: g_source_unref_internal: assertion 'source != NULL' failed

[ataffanel]

Hi, a new dependency was just added to add a 3D view in the LPS tab, this is likely causing problem here.

What distribution are you running and how did you install the client originally?

Can you try to run python3 -m pip install -e . again to see if it fixes things?

[easy98]

Hello, I installed it by the following way in my ubuntu18.04:

$ sudo apt-get install git python3 python3-pip python3-pyqt4 python3-numpy python3-zmq
$ sudo pip3 install pyusb==1.0.0b2
$ sudo pip3 install pyqtgraph appdirs

$ cd ~/crazyflie
$ git clone https://github.com/bitcraze/crazyflie-clients-python.git
$ cd crazyflie-clients-python
$ pip3 install --user -e .

$ mkdir ~/crazyflie
$ cd ~/crazyflie
$ git clone https://github.com/bitcraze/crazyflie-lib-python.git
$ cd crazyflie-lib-python
$ pip3 install --user -e .

I tried to run python3 -m pip install -e .

It doesn't work, do I need to update or add any python packages?

[ataffanel]

I see the same problem as you in a VM and I cannot explain it yet.

One fix for now is to install all dependencies with pip, the best is to do that in a venv since installing pyqt5 with pip can interfere with your system.

$ sudo apt install python3-venv
$ cd  ~/crazyflie/crazyflie-clients-python
$ python3 -m venv venv
$ . ./venv/bin/activate
(venv) $ pip3 install -e .[qt5]
(venv) $ cfclient

[easy98]

Thank you, it works for me!

[ataffanel]

Good that the workaround worked! Let's track the real bug in ticket #451.