Firefly - Is it possible to program an 8x8 LED with a max7219 module display?

Hi! I’ m currently working on a university project and I’m trying to display a simple symbol on an 8x8 led matrix using the UnoWrite command of the grasshopper firefly plugin. However I’m not sure whether this is possible.

This is the message I receive when I connect the matrix code onto UNOwrite: “data conversion failed from text to integer”. I believe the UnoWrite can only handle single digital inputs or servo inputs from 0 to 180. Is this true? and are there any alternatives to programming an 8x8 led matrix using the firefly plugin?