java.util.IllegalFormatFlagsException: %n doesn't take an argument

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java.util.IllegalFormatFlagsException: %n doesn't take an argument
at java.util.Formatter$FormatToken.checkFlags(Formatter.java:1373)
at java.util.Formatter.transform(Formatter.java:1442)
at java.util.Formatter.doFormat(Formatter.java:1081)
at java.util.Formatter.format(Formatter.java:1042)
at java.util.Formatter.format(Formatter.java:1011)
at java.lang.String.format(String.java:1554)

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