Java 2D Arrays: Image Manipulation Project. Cannot find symbol error on steps 10-15?

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I keep having this problem when trying to call the negativeColor method, where I’m getting error: Cannot find symbol on my for loops in the negativeColor method and I for the life of me cannot figure out why, I’ve been staring at this problem for 2 hours now. My code looks identical to the solution code as far as I can tell. Anybody know what error I’m making that I’m clearly not seeing?