The /cast in my first post was a typo, I generally do not like to edit posts like this for continuities sake, it was corrected in a later post. I have edited my original post so it says /click as it should.
I apologize for the confusion.

Generally when it says "invalid target" I found that meant the /assist macro was not being properly pressed. If pressing the key combination's directly worked, I would suspect there is an issue with your (Keyclone) keymap, that might be a good place to start, to ensure you have the right key map loaded to each character and all the commands are being passed properly.