Ensure you are using the correct color constants (e.g., Color.BLACK vs Color.black ) depending on your specific CodeHS library version.
If the of the row and column (row + col) is even , it gets one color. 9.1.6 checkerboard v1 codehs
Ensure your loops run while row < numRows , not <= , or you’ll hit an IndexOutOfBounds error. Ensure you are using the correct color constants (e