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:72)
at undefined.GmailQuickstart.authorize(GmailQuickstart.java:68)
at undefined.GmailQuickstart.getGmailService(GmailQuickstart.java:91)
at undefined.GmailQuickstart.main(GmailQuickstart.java:99)
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:483)

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