Hi Denishe, thank you for that information, here ist the debug output:
Starting debug for 'Slackfred'
[2018-02-18 20:38:40][ERROR: input.scriptfilter] Code 1: 20:38:39 workflow.py:1971 DEBUG get_password : fspinillo.alfredv2.slackfred:slack_api_key
20:38:40 workflow.py:1531 DEBUG Cached data saved at : /Users/alskdjalsdjk/Library/Caches/com.runningwithcrayons.Alfred-3/Workflow Data/fspinillo.alfredv2.slackfred/channels.cpickle
20:38:40 workflow.py:1830 ERROR 'ascii' codec can't encode character u'\xfc' in position 15: ordinal not in range(128)
Traceback (most recent call last):
File "/Users/laksdjalskjd/Library/Application Support/Alfred 3/Alfred.alfredpreferences/workflows/user.workflow.kjkhkhkhA/workflow/workflow.py", line 1828, in run
func(self)
File "slackfred-message.py", line 97, in main
autocomplete='{0} : {1} > '.format(channels['team'], channels['name']),
UnicodeEncodeError: 'ascii' codec can't encode character u'\xfc' in position 15: ordinal not in range(128)