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your image is not a valid chessboard (but some artificially rendered cube (?) with a chessboard pattern), you cannot use it

please e.g. print out the one from here and take a real image with your camera

your image is not a valid chessboard (but some artificially rendered 3d cube (?) with a chessboard pattern), you cannot use it

please e.g. print out the one from here and take a real image with your camera