libstruct error when structures contains a pointer

I have an integer array of pointers called "Items" defined within a structure that is part of another structure in Fortran as follows:

subroutine ex(set)
    !DEC$ ATTRIBUTES DLLEXPORT :: ex
    !DEC$ ATTRIBUTES ALIAS: 'ex' :: ex
    !DEC$ ATTRIBUTES REFERENCE :: set
    
    Type LIST_INT
        Integer :: Count = 0
        Integer, Pointer :: Items(:)
    End Type
    Type Settings
        Type(LIST_INT) :: Steps  ! Steps between output times.
    End Type
    Type(Settings), Intent(INOUT) :: set  ! Somewhere to put settings.
    
    !Testing
    set%Steps%Count = 5
    set%Steps%Items(1) = 5
    set%Steps%Items(2) = 7
end subroutine

My C header file looks like this:

#include<stdio.h>  
struct sim{
    struct step{
	int Count;
	int *Items[2];
    };
};

void ex(struct sim*);

And the script I use to call the "ex" sub-routine looks like this:

set.steps.Count = 1;
set.steps.Items(1) = 1;
set.steps.Items(2) = 1;

loadlibrary('x64\Debug\ex.dll')
s = libstruct('sim',set);
[settings] = calllib('ex', 'ex', s);

When trying to launch the script that calls the Fortran routine I get the following error:

Error using feval
A field does not match one in the struct.

Error in libstruct (line 20)
    ptr=feval(['lib.' structtype],initialvalue);

Error in program (line 31)
s = libstruct('sim',set);

This clearly refers to the way I am defining int *Items[2]. How can I solve this ?

Any help would be appreciated !