Mission Editor Problem

[MrBL]

Whenever I try to press F11 to open the mission editor Gui a message appears saying "unable to find object 'editor gui' attempting to call function 'get Id' "
Could someone help?
 

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[Thorax]

Have you changed your blockland target yet?

[Sandvich]

add "-mod editor" to the end.

[MrBL]

I've already types -mod editor in the end of the target but it still doesn't work

[MrBL]

Never Mind I just read on YouTube that mission editor is not available for the demo.
  Thanks anyway