I've had this issue for a while and with Alfred 4, I'm trying to get to the bottom of it. For some reason I'm unable to remove installed workflows through the Alfred app. I can remove them manually, through Finder or Terminal, but when i try it through Alfred, I doesn't actually remove the app. In Alfred 4, i now get an error like the image attached. I'm suspecting this is due to a permissions issue but I've followed all the access/permissions steps recommended to the letter. I've done multiple clean installs and those don't seem to help either. I'm using macOS 10.14.