java.util.UnknownFormatConversionException: Conversion = '%'

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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)

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