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

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java.lang.NullPointerException:
at mondrian.rolap.CacheControlImpl$4.visit(CacheControlImpl.java:455)
at mondrian.rolap.CacheControlImpl$MemberCellRegion.accept(CacheControlImpl.java:896)
at mondrian.rolap.CacheControlImpl$CrossjoinCellRegion.accept(CacheControlImpl.java:1043)
at mondrian.rolap.CacheControlImpl.findAxisValues(CacheControlImpl.java:501)
at mondrian.rolap.agg.SegmentCacheManager$FlushCommand.call(SegmentCacheManager.java:658)
at mondrian.rolap.agg.SegmentCacheManager$FlushCommand.call(SegmentCacheManager.java:629)
at mondrian.rolap.agg.SegmentCacheManager$Actor.run(SegmentCacheManager.java:955)
at java.lang.Thread.run(Thread.java:662)

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