pcedraw does not export

[Anniepoo]

Following the help instructions, I:

1. drew 3 objects (I changed the attributes of one, including the color)
2. selected them
3. opened a pceEmacs window
4. dragged and dropped the icon in upper right into the window

EXPECTED: prolog code in pceemacs
OBSERVED: ERROR: [Thread pce] colour ->equal: Argument 1 (colour): colour' expected, found @default/constant'

appears in console, but no prolog code appears

5. right clicked on icon, chose 'copy to clipboard'

EXPECTED: normal copy operation
OBSERVED:
Foreign predicate pce_principal:get/3 did not clear exception: error(pce(argument_type,[@17570023413379,1,colour,colour,@default]),send(@17570023381932,equal(@default)))