How to grill chicken breasts<br>Prepare the grill to help the chicken cook better. Use a grill scraper to remove any residue from the grill. Lightly spray the cooking surface with non-stick spray so the chicken will not stick to it.
make sure to use a lot of spray
it states Lightly spray the cooking surface, therefore you should not use a lot of spray. the system may have missed this as it is worded differently above 
( z1 ensure :ARG0 ( z2 you ) :ARG1 ( z3 use :ARG0 z2 :ARG1 ( z4 spray :quant ( z5 lot ) ) ) )