LogNavigation:Error: No navigation data types found while setting up required navigation types!
What is this Error . its a bug . Please Help
I ran into the same issue, i’ve disabled “Enable Navigation System” in the World settings for my level(s) since i don’t use navigation anyways. But unfortunately that didn’t solve it. So, still trying…
Edit: I’m using the 4.7 branch btw… not 4.8 (didn’t even know there was a 4.8)
Edit 2: I’ve create an empty project (only the typical minimal startup content in a level) and built it. Result:
LogNavigation:Error: No navigation data types found while setting up required navigation types!
Edit 3: Now i’ll update the official 4.7 preview to the current version and try the same there.
Edit 4: With the officially downloadable 4.7 preview 4 the project builds without problems. Thus, something’s wrong when building from source.
Yes Me too .
You can compare with the relative code in v4.6.1. In the NavigationSystem.cpp, delete:
//if (NavDataClasses.Num() == 0)
//{
// return;
//}
There are two blocks of the code above.
Then, you can temporarily fix the bug.
Thank you . it worked . 
Hi tx2line,
Are you getting the source code from the Master branch or the Promoted branch? Both of these branches are currently on 4.8. The Master branch is a “live” branch that is actively having code added to it. That means that it is inherently unstable, may crash unexpectedly, or not be able to be built at all. Promoted is a little more stable, but has not been fully tested yet so it may also have unexpected issues. We do not recommend using either of these branches for game project development.
Are you still seeing this error message? Does this appear when you are attempting to build the Engine, or when building a project?