What is the meaning of "unexpected character after line continuation character" error message when dividing a string using git filter-repo?

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This error message indicates that there is a mistake in the syntax of the command you are using, specifically in the use of a line continuation character (typically "\" in most programming languages) to split a string over multiple lines. The error message suggests that there is an unexpected character immediately following the line continuation character, which is causing the command to fail. To fix this error, carefully check the syntax of the command and ensure that you are using the correct line continuation character and that there are no unexpected characters following it.