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Fatal error: attempt to build nav collision data

I simply imported a default model into the engine from Blender. Then when I tried to launch the game, this message shows up every time, and I could not launch the game. Could anyone tell me how to fix this? alt text

Product Version: UE 4.8
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asked Jul 23 '15 at 07:12 PM in Using UE4

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ALTWang
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avatar image NuKeR2k Aug 29 '15 at 12:16 AM

Same error on my site. After importing a downloaded mesh.

avatar image ALTWang Sep 02 '15 at 07:34 PM

Hi Nuke. I found a way to solve this problem however I'm not sure if it is a correct method to do. I deleted the "saved" folder under your project in Unreal engine 4 folders, then I tried to launch it, the error is gone.

avatar image NuKeR2k Sep 04 '15 at 10:46 PM

Hi ALTWang. Thanks for your comment. My error is also gone. But I did not do anything. Just shut down the PC and next day after launching UE4 again the error was gone. I don't know what was the issue. But if I'll have this error in future again I will remember your approach and give it a try :)

avatar image ALTWang Sep 07 '15 at 03:09 AM

Hi Nuke! Thank you! I will try this way to see if it works on my levels.

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