so tenho esta imagem na tela
I just checked and the GRBL workspace loads for me fine. You should try clearing the cache or doing a force refresh (Shift F5).
Try to use Chrome or Firefox instead. That looks like Internet Explorer although it’s hard to tell as you didn’t do a whole screenshot.
Oh yeah, that is IE.
ouch you shouldn’t use Windows with a CNC, it’s got a lot of backslash …
@Simone_Marin No you didn’t do that! Where’s the -1? 
What really has a lot of backlash is that comment @Simone_Marin