Error when click on class

> On 18 Jun 2015, at 14:44, Natalia Tymchuk <[hidden email]> wrote:
>
> Hi.
> In my fresh (5 min after I started work with it)  moose 5 image,  something weird is happening. When I want to select ( click ) in system browser on any class this massage appear.
>
> <Screen Shot 2015-06-18 at 14.32.55.png>
>
> I can change the package. I don’t know about methods.
>
> Any suggestion what is wrong?
>
> Best regards,
> Natalia