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java.util.UnknownFormatConversionException: Conversion = '%'	at java.util.Formatter.checkText(Formatter.java:2579)	at java.util.Formatter.parse(Formatter.java:2565)	at java.util.Formatter.format(Formatter.java:2501)	at java.io.PrintStream.format(PrintStream.java:970)	at java.io.PrintStream.printf(PrintStream.java:871)