unknown or variably defined
in one hand, it seems that open sesame understood in the insructions (skech-pad) these (target_color; target_shape) are variables (since when I run only one shape and one color apears) , but when I tried that the color of circle in the insructions will chage in a line with target_color (and the square), it does not work, and a blue warning apears:"unknown or variably defined". I add some screenshots to make the problem more clear.
at first I thought the kind of brackets is the problem, but I tried the other kind as well and it doesn't work.
thank you all!