오류코드 [ Field error in object ]

Field error in object 'attachFile' on field 'fileNm': rejected value [org.springframework.web.multipart.commons.CommonsMultipartFile@6aefa836];
 
Field error in object 'attachFile' on field 'fileNm': rejected value [org.springframework.web.multipart.commons.CommonsMultipartFile@7a4a0c66]; 
codes [typeMismatch.attachFile.fileNm,typeMismatch.fileNm,typeMismatch.java.lang.String,typeMismatch]; arguments [org.springframework.context.support.DefaultMessageSourceResolvable: codes [attachFile.fileNm,fileNm]; arguments []; default message [fileNm]]; default message [Failed to convert property value of type 'org.springframework.web.multipart.commons.CommonsMultipartFile' to required type 'java.lang.String' for property 'fileNm'; nested exception is java.lang.IllegalStateException: Cannot convert value of type [org.springframework.web.multipart.commons.CommonsMultipartFile] to required type [java.lang.String] for property 'fileNm': no matching editors or conversion strategy found]

이런 오류가 나면.....

VO 객체를 잘봐야함.

필드와 맞지 않는 데이터형일 경우가 많음..... 나는 그랬음....