illegalFormatConversionException

[CSM413]

Will you please help me with this?
i am making application research but this happen everytime i try and play it.

Exception in thread "main" java.util.IllegalFormatConversionException: d != java.math.BigDecimal
at java.base/java.util.Formatter$FormatSpecifier.failConversion(Formatter.java:4515)
at java.base/java.util.Formatter$FormatSpecifier.printInteger(Formatter.java:3066)
at java.base/java.util.Formatter$FormatSpecifier.print(Formatter.java:3021)
at java.base/java.util.Formatter.format(Formatter.java:2791)
at java.base/java.util.Formatter.format(Formatter.java:2728)
at java.base/java.lang.String.format(String.java:4386)
at org.dsaw.poker.engine.Table.doShowdown(Table.java:675)
at org.dsaw.poker.engine.Table.playHand(Table.java:214)
at org.dsaw.poker.engine.Table.run(Table.java:154)
at org.dsaw.poker.engine.gui.Main.(Main.java:143)
at org.dsaw.poker.engine.gui.Main.main(Main.java:153)

edit: could you also tell me what data structure this uses as well as it's algorithm?
would be greatly appreciated if you could.