SAP2000 API using MATLAB - Set Stage Definitions

[pasqualesmaldini]

Dear users,
I'm using MATLAB r2014b API connection with SAP2000 v17.3.
I found some problem using the "SetStageDefinitions_1" function.
I tried to use this script, according to OAPI Documentation.

%% clean-up the workspace & command window
clear all
clc

% set the installation folder
ProgramPath='C:\Program Files (x86)\Computers and Structures\SAP2000 17\sap2000.exe';

%% pass data to Sap2000 as one-dimensional arrays
feature('COM_SafeArraySingleDim', 1);

%% pass non-scalar arrays to Sap2000 API by reference
feature('COM_PassSafeArrayByRef', 1);

%% create OAPI helper object
helper=actxserver('Sap2000v17.helper');
helper=helper.invoke('cHelper');

%% create Sap2000 object
SapObject=helper.CreateObject(ProgramPath);

%% start Sap2000 application
SapObject.ApplicationStart;

%% create SapModel object
SapModel=SapObject.SapModel;

%% initialize model
ret=SapModel.InitializeNewModel;

%% create model from template
ret=SapModel.File.New2DFrame(0, 2, 144, 2, 288);

%% add static nonlinear staged load case
ret=SapModel.LoadCases.StaticNonlinearStaged.SetCase...
('ACASE1');

MyDuration=zeros(2,1);

MyDuration(1,1)=30;
MyOutput=true;
MyOutputName={'ST1'};
MyComment={'Build structure'};

ret=SapModel.LoadCases.StaticNonlinearStaged.SetStageDefinitions_1...
('ACASE1', 1, MyDuration, MyOutput, MyOutputName, MyComment)

%% close Sap2000
ret=SapObject.ApplicationExit(false());
SapModel=0;
SapObject=0;

I received the following error from MATLAB an of course it's not still working on SAP.

Error using
Interface.2CE898D9_F0EA_4961_970F_D8A5FC72BC89/SetStageDefinitions_1
Error: Type mismatch, argument 3

Error in TEST_SETSTAGEDATA (line 44)
ret=SapModel.LoadCases.StaticNonlinearStaged.SetStageDefinitions_1...

I checked it on internet ad I understood that the problem is is "MyOutput" variable. I defined it as a logical value, comparing the Boolean one of VisualBasic language but it doesn't work.

Does anyone know how to help me and solve this problem?
Thank you to everyone in advance.