<WebClient upload file> I tried to upload a file u...

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WebClient upload file
I tried to upload a file using webclient like below
val builder = MultipartBodyBuilder()
builder.part("file", ByteArrayResource(multipartFile.bytes)).filename(multipartFile.name)

webClient.post().uri(applicationProperties.uploadFile)
.body(BodyInserters.fromMultipartData(builder.build()))
.retrieve()
.bodyToMono(UploadImageResponse::class.java)

but i have this error...