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

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java.lang.NullPointerException:
at battlecode.world.RobotControllerImpl.canSenseAllOfCircle(RobotControllerImpl.java:223)
at battlecode.world.RobotControllerImpl.assertCanSenseAllOfCircle(RobotControllerImpl.java:187)
at battlecode.world.RobotControllerImpl.onTheMap(RobotControllerImpl.java:203)
at v1.Gardener.loop(Gardener.java:12)
at v1.RobotPlayer.run(RobotPlayer.java:15)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:497)
at battlecode.instrumenter.SandboxedRobotPlayer.loadAndRunPlayer(SandboxedRobotPlayer.java:259)
at battlecode.instrumenter.SandboxedRobotPlayer.lambda$new$2(SandboxedRobotPlayer.java:180)
at java.lang.Thread.run(Thread.java:745)

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