error in level return-to-thornbush-farm

Bugs
1

There is an error in one level:
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I have to build 3 defenses, but when I build the first one I get locked in and can’t build the second one.

2

What course is it in? What’s the level number?

3

Can you show your code?

4

I’m not sure what you’re trying to say. Are you building walls instead of fire-traps?