hi! I bought the 3D Tower Defense Starter Kit and its manual tells me that "this Starter Kit uses the distribution version of NGUI. If you own NGUI, the first thing you likely want to do is to get rid of its watermark. To do that, simply open a new scene, delete the NGUI folder of this kit and import your full version." (Page 24.) So I bought the NGUI from the Unity Asset Store. Then I created a new, empty scene. Then I removed (deleted) the entire NGUI folder, inside the 3D Tower Defense Starter project. I.e. in the Unity Project Window. Then I went into the Asset Store and selected import. The NGUI foldren then became visible in the Unity Project Window, but outside the 3D Tower Defense Starter folder. So I dragged it in there. Then I selected a scene in 3D Tower Defense Starter and clicked the Unity PLAY button. But I get an error. See attached screenshot. Point me in the right direction and I will try and fix this. Thx in advance.