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操作失败，Could not write JSON: Null key for a Map not allowed in JSON (use a converting NullKeySerializer?); nested exception is com.fasterxml.jackson.databind.JsonMappingException: Null key for a Map not allowed in JSON (use a converting NullKeySerializer?) (through reference chain: org.jeecg.common.api.vo.Result["result"]->com.alibaba.fastjson.JSONObject["sysAllDictItems"]->java.util.HashMap["null"])