No parameter found by that name - but it is correct

Hi,
I am trying to get curtain panels to rotate according to a parameter value.No matter which way I try, the error above returns; the image shows multiple selection methods and use of different parameter setting nodes, and the parameter names as correct, but still I receive the stated error.

Can anyone assist?

Thanks

maybe rotate the grid?

You need to put your parameter names in quotes to input them as string values. Right now you are inputting nulls.

Thanks! how inattentive of me.