MissingFormatArgumentException: Format Specifier 'S'

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String format = "%s/%s"; String.format(format, "a");

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Exception in thread "main" java.util.MissingFormatArgumentException: Format specifier 's' at java.util.Formatter.format(Unknown Source) at java.util.Formatter.format(Unknown Source) at java.lang.String.format(Unknown Source) at Concatenation.testFormat(Concatenation.java:17) at Concatenation.main(Concatenation.java:4)

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String s = "%country%/%city%".replace("%country%", "China").replace("%city%", "Beijing");