json - ios swift 3 - POST UInt8 array -

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i'm trying send image (as uint8 array) in request app crash @ line of code

 _request.httpbody = try? jsonserialization.data(withjsonobject : self.parameters , options: [])

where self.parameters dictionary

the crash message "invalid type in json write (_swiftvalue)"

does know how solve problem ?


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