Hi, i want to display a message on my screen during run. my code is below:
...
(run-until 500 (at-every 100 (display "fine!")))
...
but program stops at point of time 100. the errors are:
ERROR: In procedure procedure-property:
ERROR: Wrong type argument in position 1: #<unspecified> who could help
me correct this code? thanks,
--
Huazhong Wang
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