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The error message 'invalid (to - from)/by ggpattern' means that there is an issue with the "ggpattern" argument in the seq.default function. This error message is indicating that the "ggpattern" argument is not a valid argument for the seq.default function. "ggpattern" is not a standard argument for the seq.default function and most likely has been added by a third-party package or custom code.