I encountered an error: navmeshinfo xxxxxx has an invalid door portal to form xxxxx, removing the portal. As far as I understand, this error occurs when navmeshes created after the doormarker was placed. In order to fix it - you need to put the door on one of the triangles and after that press finalise.
Last edited by grumpycat on 14 Mar 2014 - 20:42.

If you want this to be fixed
If you want this to be fixed you should probably figure out exactly where the error is. Otherwise its a needle in a haystack.