Let's Make Robots!

Robot sensor won't detect anything

I'm building the "How to make your first robot" robot and i'm stuck on the programming part. I've been trying to figure this out for 2 hours now and i'm about to go insane. 

This is my code






Symbol dangerlevel = 70 ' how far away should thing be, before we react?

symbol turn = 300 ' this sets how much should be turned

symbol servo_turn = 700 ' This sets for how long time we should wait for the servo to turn (depending on it´s speed) before we measure distance