[FIXED] Why Spyder 5.0.0 Application Launch Error when launching from user defined environments?

Issue

I upgraded Spyder to 5.0.0 for all the environments. It launches without error when I launch it from base environment but produces Application Launch Error when I try to launch it from other environments. the error is as follows -

Traceback (most recent call last):

File "C:\Users\user\.conda\envs\KB\Scripts\spyder-script.py", line 10, in 
sys.exit(main())

File "C:\Users\user\.conda\envs\KB\lib\site-packages\spyder\app\start.py", line 214, in main
mainwindow.main(options, args)

File "C:\Users\user\.conda\envs\KB\lib\site-packages\spyder\app\mainwindow.py", line 2293, in main
mainwindow = create_window(app, splash, options, args)

File "C:\Users\user\.conda\envs\KB\lib\site-packages\spyder\app\mainwindow.py", line 2146, in create_window
main.setup()

File "C:\Users\user\.conda\envs\KB\lib\site-packages\spyder\app\mainwindow.py", line 882, in setup
plugin_instance = plugin_class(self, configuration=CONF)

File "C:\Users\user\.conda\envs\KB\lib\site-packages\spyder\api\plugins.py", line 1425, in __init__
widget.set_icon(self.get_icon())

File "C:\Users\user\.conda\envs\KB\lib\site-packages\spyder\plugins\profiler\plugin.py", line 70, in get_icon
return self.create_icon('profiler')

File "C:\Users\user\.conda\envs\KB\lib\site-packages\spyder\api\plugins.py", line 1136, in create_icon
return ima.icon(name)

File "C:\Users\user\.conda\envs\KB\lib\site-packages\spyder\utils\icon_manager.py", line 380, in icon
return qta.icon(*args, **kwargs)

File "C:\Users\user\.conda\envs\KB\lib\site-packages\qtawesome\__init__.py", line 146, in icon
return _instance().icon(*names, **kwargs)

File "C:\Users\user\.conda\envs\KB\lib\site-packages\qtawesome\iconic_font.py", line 305, in icon
names[i]))

File "C:\Users\user\.conda\envs\KB\lib\site-packages\qtawesome\iconic_font.py", line 353, in _parse_options
prefix, chars = self._get_prefix_chars(names)

File "C:\Users\user\.conda\envs\KB\lib\site-packages\qtawesome\iconic_font.py", line 384, in _get_prefix_chars
raise Exception(error)

Exception: Invalid icon name "timer-outline" in font "mdi" 

Solution

(Spyder maintainer here) To fix this problem you need to install the 1.0.2 version of the QtAwesome package in your environment.

You can do that by opening the Anaconda Prompt and running the following commands:

conda activate KB
conda install qtawesome=1.0.2

Note: There won't be a need to do this with Spyder 5.0.1, released on April 16th and soon to be part of Anaconda.

Answered By - Carlos Cordoba