When playing using Android App, there is some spots I can't build on, I always got a pop- up form telling me that I am going to build the earth wall. I face this on the same spots on all servers.
also have that whit app version,
app is a big mistake, but at all this is a great game
Yes, we need to improve the App and are working on it.
In the mean time it is helpful to ensure we use the latest version of the App and that our mobile devise is kept up to date with all it's own updates.