java.lang.IllegalStateException: Unknown pdx type=4

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Unknown pdx type=4
java.lang.IllegalStateException: Unknown pdx type=4
at com.gemstone.gemfire.internal.InternalDataSerializer.readPdxSerializable(InternalDataSerializer.java:3162)
at com.gemstone.gemfire.internal.InternalDataSerializer.basicReadObject(InternalDataSerializer.java:2979)
at com.gemstone.gemfire.DataSerializer.readObject(DataSerializer.java:3210)
at com.gemstone.gemfire.internal.util.BlobHelper.deserializeBlob(BlobHelper.java:101)
at com.gemstone.gemfire.internal.cache.EntryEventImpl.deserialize(EntryEventImpl.java:1554)
at com.gemstone.gemfire.internal.cache.EntryEventImpl.deserialize(EntryEventImpl.java:1546)
at com.gemstone.gemfire.internal.cache.PreferBytesCachedDeserializable.getDeserializedValue(PreferBytesCachedDeserializable.java:67)
at com.gemstone.gemfire.internal.cache.EntryEventImpl.getOldValue(EntryEventImpl.java:723)
at com.gemstone.gemfire.internal.cache.LocalRegion.validatedDestroy(LocalRegion.java:1146)
at com.gemstone.gemfire.internal.cache.LocalRegion.destroy(LocalRegion.java:1130)
at com.gemstone.gemfire.internal.cache.AbstractRegion.destroy(AbstractRegion.java:315)
at com.gemstone.gemfire.internal.cache.LocalRegion.remove(LocalRegion.java:9372)
at com.igola.datahub.wwl.geode.WWLResultsDAO.removeByKey(WWLResultsDAO.java:276)

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