java.lang.IllegalArgumentException: Invalid reference 'PDch'!

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java.lang.IllegalArgumentException: Invalid reference 'PDch'!
at org.springframework.data.mongodb.core.aggregation.ExposedFieldsAggregationOperationContext.getReference(ExposedFieldsAggregationOperationContext.java:63)
at org.springframework.data.mongodb.core.aggregation.ExposedFieldsAggregationOperationContext.getReference(ExposedFieldsAggregationOperationContext.java:47)
at org.springframework.data.mongodb.core.aggregation.GroupOperation.toDBObject(GroupOperation.java:284)

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