Error in the output of dsp.SpectrumAnalyzer in matlab R2016a

Array formation and parentheses-style indexing with objects of class 'dsp.SpectrumAnalyzer' is not allowed. Use objects of class 'dsp.SpectrumAnalyzer' only as scalars or use a cell array.

How to clear this error? I have attached the code. Please help me with this.

hset = 'H-Set1';     % H-Set number
modulation = 'QPSK'; % Modulation scheme
preconfigParams = umtsDownlinkReferenceChannels(hset,modulation); % Get H-Set parameters
frcWaveform = umtsDownlinkWaveformGenerator(preconfigParams);     % Generate H-Set waveform
% H-Set parameter structure definition from scratch
% General settings
downlinkParams.TotFrames = 1;                      % Number of frames to be generated
downlinkParams.PrimaryScramblingCode = 0;          % Primary scrambling code
downlinkParams.FilterType = 'RRC';                 % Enable the RRC filter
downlinkParams.OversamplingRatio = 4;              % Oversampling set to 4
downlinkParams.NormalizedPower = 'Off';            % Power normalization disabled

% Define Downlink Dedicated Physical Channel  (DPCH)
downlinkParams.DPCH.Enable = 'On';                 % Enable DPCH
downlinkParams.DPCH.SlotFormat = 11;               % DPCH slot format
downlinkParams.DPCH.SpreadingCode = 6;             % DPCH spreading code
downlinkParams.DPCH.NMulticodes = 1;               % Number of DPCH
downlinkParams.DPCH.SecondaryScramblingCode = 1;   % Secondary scrambling code
downlinkParams.DPCH.TimingOffset = 0;              % Timing Offset
downlinkParams.DPCH.Power = 0;                     % Power in dB
downlinkParams.DPCH.TPCData = 0;                   % TPC value
downlinkParams.DPCH.TFCI = 0;                      % TFCI value
downlinkParams.DPCH.DataSource = 'CCTrCH';         % DPCH data source is CCTrCH
% DPCH carries the Coded Composite Transport Channel (CCTrCH) containing
% one or more transport channels. Since DPCH source is specified as CCTrCH,
% define the CCTrCH containing DTCH and DCCH transport channels
% Build DTCH definition
TrCH(1).Name = 'DTCH';                             % Name of the transport channel
TrCH(1).CRC = '16';                                % CRC type
TrCH(1).TTI = 20;                                  % TTI in ms
TrCH(1).CodingType = 'conv3';                      % The coding type and rate
TrCH(1).RMA = 256;                                 % Rate matching attribute
TrCH(1).DataSource = 'PN9-ITU';                    % Tr channel data source
TrCH(1).ActiveDynamicPart = 1;                     % Index to active dynamic part
TrCH(1).DynamicPart(1) = struct('BlockSize',244,'BlockSetSize',244); % 1x244 blocks
% Build DCCH definition
TrCH(2).Name = 'DCCH';                             % Name of the transport channel
TrCH(2).CRC = '12';                                % CRC type
TrCH(2).TTI = 40;                                  % TTI in ms
TrCH(2).CodingType = 'conv3';                      % The coding type and rate
TrCH(2).RMA = 256;                                 % Rate matching attribute
TrCH(2).DataSource = 'PN9-ITU';                    % Tr channel data source
TrCH(2).ActiveDynamicPart = 1;                     % Index to active dynamic part
TrCH(2).DynamicPart(1) = struct('BlockSize',100,'BlockSetSize',100);   % 1x100 blocks
% Finalize CCTrCH structure array using the TrCH structures defined above
downlinkParams.DPCH.CCTrCH.Name = 'DCH';           % Name of the CCTrCH
downlinkParams.DPCH.CCTrCH.DTXPosition = 'fixed';  % DTX position
downlinkParams.DPCH.CCTrCH.TrCH = TrCH;            % Assign DTCH/DCCH to CCTrCH

% Define P-CCPCH
downlinkParams.PCCPCH.Enable = 'On';               % Enable P-CCPCH
downlinkParams.PCCPCH.Power = 0;                   % Set power to be 0dB
downlinkParams.PCCPCH.DataSource = 'CCTrCH';       % P-CCPCH data source is CCTrCH
% P-CCPCH CCTrCH carries the BCH transport channel. Since P-CCPCH source is
% CCTrCH, define CCTrCH containing BCH
clear TrCH;
TrCH(1).Name = 'BCH';                              % Name of the Tr channel
TrCH(1).CRC = '16';                                % CRC type
TrCH(1).TTI = 20;                                  % TTI in ms
TrCH(1).CodingType = 'conv2';                      % The coding type and rate
TrCH(1).RMA = 256;                                 % Rate matching attribute
TrCH(1).DataSource = 'PN9-ITU';                    % Tr channel data source
TrCH(1).ActiveDynamicPart = 1;                     % Index to active dynamic part
TrCH(1).DynamicPart(1) = struct('BlockSize',246,'BlockSetSize',246); % 1x246 block
% Finalize CCTrCH structure array using the TrCH structure defined above
downlinkParams.PCCPCH.CCTrCH.Name = 'BCH';         % Name of the CCTrCH
downlinkParams.PCCPCH.CCTrCH.DTXPosition = 'fixed';% DTX position
downlinkParams.PCCPCH.CCTrCH.TrCH = TrCH;          % Assign BCH to CCTrCH

% Define S-CCPCH, but this channel is not required for H-Set1 generation
downlinkParams.SCCPCH.Enable = 'Off';              % Disable S-CCPCH
downlinkParams.SCCPCH.SlotFormat = 7;              % Slot format number
downlinkParams.SCCPCH.SpreadingCode = 3;           % S-CCPCH spreading code
downlinkParams.SCCPCH.SecondaryScramblingCode = 3; % Secondary scrambling code
downlinkParams.SCCPCH.TimingOffset = 0;            % Timing Offset
downlinkParams.SCCPCH.Power = 0;                   % Power in dB
downlinkParams.SCCPCH.TFCI = 0;                    % TFCI value
downlinkParams.SCCPCH.DataSource = 'CCTrCH';       % S-CCPCH data source is CCTrCH
% S-CCPCH CCTrCH can carry PCH and FACH transport channels. Since S-CCPCH
% source is CCTrCH, define CCTrCH containing PCH and FACH
% Build PCH definition
TrCH(1).Name = 'PCH';                              % Name of the Tr channel
TrCH(1).CRC = '16';                                % CRC type
TrCH(1).TTI = 10;                                  % TTI in ms
TrCH(1).CodingType = 'conv2';                      % The coding type
TrCH(1).RMA = 256;                                 % Rate matching attribute
TrCH(1).DataSource = 'PN9-ITU';                    % Tr channel data source
TrCH(1).ActiveDynamicPart = 1;                     % Index to active dynamic part
TrCH(1).DynamicPart(1) = struct('BlockSize',64,'BlockSetSize',64);   % 1x64 block
% Build FACH definition
TrCH(2).Name = 'FACH';                             % Name of the Tr channel
TrCH(2).CRC = '16';                                % CRC type
TrCH(2).TTI = 10;                                  % TTI in ms
TrCH(2).CodingType = 'turbo';                      % The coding type
TrCH(2).RMA = 256;                                 % Rate matching attribute
TrCH(2).DataSource = 'PN9-ITU';                    % Tr channel data source
TrCH(2).ActiveDynamicPart = 1;                     % Index to active dynamic part
TrCH(2).DynamicPart(1) = struct('BlockSize',360,'BlockSetSize',360);   % 1x360 block
% Finalize CCTrCH using the above
downlinkParams.SCCPCH.CCTrCH.Name = '';            % Name of the CCTrCH
downlinkParams.SCCPCH.CCTrCH.DTXPosition = 'fixed';% DTX position
downlinkParams.SCCPCH.CCTrCH.TrCH = TrCH;          % Assign PCH/FACH to CCTrCH

% Define P-CPICH
downlinkParams.PCPICH.Enable = 'On';               % Enable P-CPICH
downlinkParams.PCPICH.Power = 0;                   % Power in dB

% Define S-CPICH
downlinkParams.SCPICH.Enable = 'Off';              % Disable S-CPICH
downlinkParams.SCPICH.SpreadingCode = 4;           % S-CPICH spreading code
downlinkParams.SCPICH.SecondaryScramblingCode = 4; % Secondary scrambling code
downlinkParams.SCPICH.Power = 0;                   % Power in dB

% Define P-SCH
downlinkParams.PSCH.Enable = 'On';                 % Enable P-SCH
downlinkParams.PSCH.Power = 0;                     % Power in dB

% Define S-SCH
downlinkParams.SSCH.Enable = 'On';                 % Enable S-SCH
downlinkParams.SSCH.Power = 0;                     % Power in dB

% Define PICH
downlinkParams.PICH.Enable = 'On';                 % Enable PICH
downlinkParams.PICH.SpreadingCode = 16;            % PICH spreading code
downlinkParams.PICH.TimingOffset = 0;              % Timing offset
downlinkParams.PICH.Power = 0;                     % Power in dB
downlinkParams.PICH.DataSource = 'PagingData';     % PICH data source
downlinkParams.PICH.Np = 144;                      % Number of paging indicators

% Define HSDPA
downlinkParams.HSDPA.Enable = 'On';                % Enable HSDPA channels
downlinkParams.HSDPA.CodeGroup = 5;                % Number of HS-PDSCHs
downlinkParams.HSDPA.CodeOffset = 1;               % Code offset to first HS-PDSCH
downlinkParams.HSDPA.Modulation = 'QPSK';          % Modulation scheme
downlinkParams.HSDPA.VirtualBufferCapacity = 9600; % Buffer capacity
downlinkParams.HSDPA.InterTTIDistance = 3;         % Inter TTI interval
downlinkParams.HSDPA.NHARQProcesses = 2;           % Number of HARQ processes
downlinkParams.HSDPA.XrvSequence = [0 2 5 6];      % The XRV sequence
downlinkParams.HSDPA.UEId = 0;                     % UE Identity
downlinkParams.HSDPA.TransportBlockSizeId = 41;    % The transport block size id
downlinkParams.HSDPA.HSSCCHSpreadingCode = 9;      % Shared channel spreading code
downlinkParams.HSDPA.SecondaryScramblingCode = 6;  % Secondary scrambling code
downlinkParams.HSDPA.HSPDSCHPower = 0;             % HS-PDSCH power in dB
downlinkParams.HSDPA.HSSCCHPower = 0;              % HS-SCCH power in dB
downlinkParams.HSDPA.DataSource = 'HSDSCH';        % Data source is HS-DSCH
% HS-DSCH transport channel definition
downlinkParams.HSDPA.HSDSCH.BlockSize = 3202;      % The transport block size
downlinkParams.HSDPA.HSDSCH.DataSource = 'PN9-ITU';% HS-DSCH data source

% Define OCNS channels as defined in TS25.101 Table C.13
downlinkParams.OCNS.Enable = 'On';                 % Enable OCNS channels
downlinkParams.OCNS.Power = 0;                     % OCNS power scaling in dB
downlinkParams.OCNS.OCNSType = 'H-Set_6DPCH';      % OCNS definition

% The structure defined above can be used to generate the waveform:
frcWaveform2 = umtsDownlinkWaveformGenerator(downlinkParams);

% For completeness we can see that the H-Set definition structures obtained
% by the above two parameterization approaches are identical
if(isequal(preconfigParams,downlinkParams))
    disp(['H-Set1 configuration structures generated with and without using' ...
    ' umtsDownlinkReferenceChannels function are the same.']);
end
if(isequal(frcWaveform,frcWaveform2))
    disp(['H-Set1 waveforms generated with and without using' ...
    ' umtsDownlinkReferenceChannels function are the same.']);
end
chiprate = 3.84e6;   % Chip rate of the baseband waveform
spectrumPlot = dsp.SpectrumAnalyzer('SampleRate', chiprate*downlinkParams.OversamplingRatio);
spectrumPlot.Title = sprintf('Spectrum of Fixed Reference Channel (FRC) %s (%s) waveform', hset, modulation);
spectrumPlot.YLimits = [-100,40];
spectrumPlot(frcWaveform);