I do get this message when launching my Groupy 2 shortcut. I have updated my shortcut but the error message continues.

That is because the Discord version changed. If you go to this directory:
\AppData\Local\Discord
It has Discord.exe in the version. Since Discord updates seemingly every single day (true story) it makes creating shortcuts to it (or a Groupy file that references where it was prior) nearly impossible.
You wont get that error message if you edit the groupy save file to match the version.
The alternate is to have a group file that looks like this
[Group]
GroupCount=2
GroupLeft=255
GroupTop=305
GroupRight=2561
GroupBottom=1529
GroupMax=0
Locked=0
[GroupyEntry1]
StoreApp=1
OwnerProcess=Microsoft.WindowsNotepad_8wekyb3d8bbwe!App
APPID=Microsoft.WindowsNotepad_8wekyb3d8bbwe!App
NewTabName=
RunElevated=0
NoPatternMatching=1
Target=Microsoft.WindowsNotepad_8wekyb3d8bbwe!App
MatchingClass=Notepad
[GroupyEntry2]
OwnerProcess=C:\Users\seand\AppData\Local\Discord\Update.exe
APPID=com.squirrel.Discord.Discord
NewTabName=
RunElevated=0
NoPatternMatching=0
CommandLine=--processStart Discord.exe
WorkingDirectory=C:\Users\seand\AppData\Local\Discord
Target=C:\Users\seand\AppData\Local\Discord\Update.exe
MatchingClass=Chrome_WidgetWin_1
The issue there is that since groupy is starting, it likely will not group but will open (every time). If you can live with that, having to manually group Discord each time, then you should be good.