java.lang.ClassCastException: java.net.URL

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java.lang.ClassCastException: java.net.URL
at java.util.TreeMap.compare(Unknown Source)
at java.util.TreeMap.getEntry(Unknown Source)
at java.util.TreeMap.containsKey(Unknown Source)
at java.util.TreeSet.contains(Unknown Source)
at undefined.TESTTREESET.testIt(TESTTREESET.java:27)

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