repast运行出现java.lang.NullPointerException，怎么解决呢
在对repastS中已有仿真例子运行中，会出现java.lang.NullPointerException，然后就运行不了了：ERROR 21:46:56,324 saf.core.runtime.Boot - null
java.lang.NullPointerException
at saf.core.runtime.Boot.init(Boot.java:79)
at saf.core.runtime.Boot.main(Boot.java:250)
at repast.simphony.runtime.RepastMain.main(RepastMain.java:43)
ERROR - null
java.lang.NullPointerException
at saf.core.runtime.Boot.init(Boot.java:79)
at saf.core.runtime.Boot.main(Boot.java:250)
at repast.simphony.runtime.RepastMain.main(RepastMain.java:43)
ERROR 21:46:56,397 saf.core.runtime.Boot - null
java.lang.NullPointerException
at saf.core.runtime.Boot.run(Boot.java:105)
at saf.core.runtime.Boot.main(Boot.java:251)
at repast.simphony.runtime.RepastMain.main(RepastMain.java:43)
ERROR - null
java.lang.NullPointerException
at saf.core.runtime.Boot.run(Boot.java:105)
at saf.core.runtime.Boot.main(Boot.java:251)
at repast.simphony.runtime.RepastMain.main(RepastMain.java:43)
请问怎么解决哇，谢谢各位
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