Error: It seems there is already an app at: ....

[molleweide]

When trying to install or uninstall some casks I get this message:

...
...
Warning: No checksum defined for cask 'teensy', skipping verification.
==> Purging files for version 1.52 of Cask teensy
Error: Problems with multiple casks:
criptext: It seems there is already an App at '/usr/local/Caskroom/criptext/latest/Criptext.app'.
drawio: It seems there is already an App at '/usr/local/Caskroom/drawio/13.0.3/draw.io.app'.
keepassxc: It seems there is already an App at '/usr/local/Caskroom/keepassxc/2.5.4/KeePassXC.app'.
reaper: It seems the App source '/Users/hjalmarjakobsson/reaper/app/RPPTEST/REAPER.app' is not there.
teensy: It seems there is already an App at '/usr/local/Caskroom/teensy/latest/teensy.app'.

Does this mean that I have to do some kind of manual installation/uninstall of these packages?
Also the reaper package is a special audio program that I have installed to a custom location just fyi.