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

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java.lang.NullPointerException:
at java.io.Reader.(Reader.java:78)
at java.io.InputStreamReader.(InputStreamReader.java:97)
at org.wltea.analyzer.dic.Dictionary.loadMainDict(Dictionary.java:237)
at org.wltea.analyzer.dic.Dictionary.initial(Dictionary.java:107)
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)

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