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This error message means that the input JSON string contains one or more control characters that are not allowed in JSON strings and need to be escaped. Control characters are characters in the Unicode range U+0000 through U+001F, such as null, tab, newline, and carriage return. To fix the error, you need to escape the control characters using the appropriate escape sequences, such as \n for newline, \r for carriage return, and \uXXXX for other Unicode characters.