Delete this card command not working in LIvecode 5.5.3

[stgoldberg at aol.com]

If I want to delete a card using the message box in LC 5.5.3 (on Mac 10.9.5) it works if I type


delete this card 


in the message box.  However, I get an error message if I try the same thing from a button on the card or from a script in the stack.  This didn't used to be the case.  Any suggestions?
Thanks!
Happy New Year,
Stephen Goldberg
stgoldberg at aol.com