Custom part model not loading

[ManicMoustache]

I created a .blend and imported it into unity, and got an error:

"File error: Could not load type 'UnityEngine.Rendering.ShadowCastingMode' from assembly 'UnityEngine, Version=0.0.0.0, Culture=neutral, PublicKeyToken=null'.
  at KSPPartTools.PartWriter.WriteChild (System.IO.BinaryWriter bw, UnityEngine.Transform t) [0x00000] in <filename unknown>:0 
  at KSPPartTools.PartWriter.Write (System.String modelName, System.String filePath, UnityEngine.Transform target, TextureFormat textureFormat) [0x00000] in <filename unknown>:0" 

I had a correctly mapped uv-texture in my part folder as well as a cfg. I used parttools to export the mu but it did not export a texture. When I launched ksp and tried to launch the part by itself, it said that there was "no part size information available." When I saved and opened a craft with only this part in it, there was no spaceplane hanger or kerbin. The game proceeded to crash. There is definitely something I did wrong.

Edited December 22, 2018 by ManicMoustache
forgot to put some things in.