TypeError: Invalid attempt to destructure non-iterable instance

HI...
im new in this project...but when run the code like belove

```
export function showMessage() {
return {
type: SHOW_MESSAGE,
promise: (client) => client.get('/posts')
};
}
```

i get this error:
TypeError: Invalid attempt to destructure non-iterable instance
can anyone Helllllp Me???
tnx