How to Parse the given JSON Specially Which contains Array using ObjectMapper - swift3

Question

import Foundation
import ObjectMapper
class MemberActivityCollection: Mappable
{
var TotalRows : Int = 0
var MemberActivityList : Array<MemberActivity> = Array()
var MemberID: Int = 0
init(){ }
internal required init?(map: Map) { }
// Mappable
func mapping(map: Map) {
MemberActivityList <- map["MemberActivityList"]
TotalRows <- map["TotalRows"]
MemberID <- map["MemberID"]
}
}
class MemberActivity: Mappable
{
var ActivityID: Int = 0
var fk_MemberID: Int = 0
var ActivityDate: String!
var ActivityFrom: String!
var ActivityTo: String!
var AvgPace: String!
init(){ }
internal required init?(map: Map) { }
// Mappable
func mapping(map: Map) {
ActivityID <- map["ActivityID"]
fk_MemberID <- map["fk_MemberID"]
ActivityDate <- map["ActivityDate"]
ActivityFrom <- map["ActivityFrom"]
ActivityTo <- map["ActivityTo"]
AvgPace <- map["AvgPace"]
}
}
Please Note : The MemberActivityCollection Class has Array of MemberActivity Class
Need to Parse the JSON as MemberActivityCollection
{
"TotalRows" : 16,
"MemberActivityList" : [
{
"fk_MemberID" : 47,
"ActivityID" : 29,
"ActivityFrom" : "18:30:00",
"ActivityTo" : "14:30:00",
"AvgPace" : "3.00"
},
{
"fk_MemberID" : 47,
"ActivityID" : 26,
"ActivityFrom" : "01:07:46",
"ActivityTo" : "05:07:00",
"AvgPace" : "5.00"
},
{
"fk_MemberID" : 47,
"ActivityID" : 35,
"ActivityFrom" : "09:30:00",
"ActivityTo" : "04:15:00",
"AvgPace" : "0.06"
}
],
"MemberID" : 47
}
Using the following code to map the json to object of MemberActivityCollection Class
Am I declaring the property MemberActivityList wrong way??
The whole idea is to map the json in MemberActivityCollection class so that one of its property ("MemberActivityList") can hold the detailed data
To Achieve that I wrote following lines of code and not getting the desired output (As mentioned in the above line).
let objMAC : MemberActivityCollection = Mapper<MemberActivityCollection>().map(JSONObject: jsonData)! //Datatype of jsonData variable is JSON
The above statement throws error message that 'EXC_BAD_INSTRUCTION(code=EXC_I386_INVOP, subcode=0x0'
Please explain the correct way to achieve this.