How may I correctly make a new mission?

[Apophis]

I'm currently having trouble with "New Mission"; Whenever I go in F11, and load "New Map", an error stating : "Could not execute mission file "editor/newMission.mis""

What am I supposed to do? I don't know how to fix that.
Reward, 

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[heedicalking]

You cannot make new missions. To make your own though, go into bedroom and delete the build, clock and move the spawn down. Then hit edit and hit relight scene. Now gimme dose cookys!

[Apophis]

Okay, here..

You obtained  (5)!!

Thanks.