filling ngx-select-ex using enum

[erickvls]

How can i filling my select using enum in my component? I can see my enum with the strings but i cant get the value.

This is my select using enum in html
link.

This is my enum in my component.ts
link

in my component in onInit i have this for fill my select in html
`export class MyComponent{

orientacaoSexual: string[];

ngOnInit(): void {
    var orientacaoSexual = Object.keys(OrientacaoSexual);
    this.orientacaoSexual = orientacaoSexual.slice(orientacaoSexual.length / 2);`

and in my html page i have

<ngx-select (selectionChanges)="parseValue($event.target.value)" placeholder="Selecione o Estado" [items]="orientacaoSexual" optionValueField="orientacaoSexual"></ngx-select>

and when i click in any select option i get this error.
link