When try to start meeting in return error InvalidArguments

when try to start meeting in ios not open any think and return error MobileRTCMeetError_InvalidArguments

        let parameters = MobileRTCMeetingStartParam()
            parameters.meetingNumber = meetingNumber;
           parameters.isAppShare=true;
        meetingService.delegate = self
   
        var a = meetingService.startMeeting(with: parameters)

app in ios 13 developemnt

Hey @masterlyapp,

Thanks for using the dev forum!

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Thanks!
Michael