"Navmesh needs to be rebuilt"

Whey I was putting in a navmesh, it said that it needs to be rebuilt “Navmesh needs to be rebuilt”.

I did not see any what to built the navmesh. How can I do this?

Thank you

Click Build → Build Paths
If it doesn’t work
check recast mesh agent radius value. It should be greater than 34

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Yep and maybe you have to add one someday. Clicking “P” you can se where your Character can step on. Sometimes you may rebuild lighting to.