Arrays are picky. I would delete the middle reference plane, and then assign the the same formula to the cabinet width and the distance between the initial cabinet and it's array to second partner.

It's generally best to use a nested family when dealing with arrays. Are you trying to array an extrusion or a nested family?

What I've noticed is that Revit likes to array the same "thing" and complains when that "thing" changes. For example, an extrusion is a "thing" made up of a sketch, level, distances, etc, which will change when the "thing" changes. A family is a "thing" made up of "loadable family with parameters", which is still a "loadable family with parameters" even if you change the value of those parameters.

I'll bet you are trying to drive the arrayed item geometry from family geometry - i.e. you have your cabinet (extrusion) locked to 2 reference planes. If you don't want to make your cabinets individual families, try adding the reference planes and parameter into the extrusion sketch. When building the array, make sure you tab through to select the Extrusion:Reference when aligning or locking dimensions.