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

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java.lang.NullPointerException:
at com.cenqua.fisheye.rep.SortedMapFileHistory.getRevision(SortedMapFileHistory.java:87)
at com.cenqua.fisheye.api.ApiImplementation.parseRevisionRequest(ApiImplementation.java:598)
at com.cenqua.fisheye.api.ApiImplementation.doGetRevision(ApiImplementation.java:561)
at com.cenqua.fisheye.api.ApiImplementation.handleCommand(ApiImplementation.java:186)
at com.cenqua.fisheye.api.ApiImplementation.handle(ApiImplementation.java:178)
at com.cenqua.fisheye.api.BaseApiServlet.doPost(BaseApiServlet.java:25)
at com.cenqua.fisheye.api.BaseApiServlet.doGet(BaseApiServlet.java:16)

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