java.lang.NullPointerException: This exception has no message.

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NullPointerException when using -battle option from cmd-line

This exception has no message.

NullPointerException in BaseBattle.getNumRounds()

This exception has no message.

java.lang.NullPointerException: 	at net.sf.robocode.battle.BaseBattle.getNumRounds(BaseBattle.java:110)	at net.sf.robocode.battle.BaseBattle.run(BaseBattle.java:202)	at java.lang.Thread.run(Thread.java:619)