Unity3d - Failed to load 'Assets/Plugins/QCARWrapper.dll'

Question

I want to use c++ dll on unity android application. To use native dll on a android device, I learn that I should use Unity 5. I download unity5 from here. My application req

Answer 1

I had the same problem /Failed to load 'Assets/Plugins/QCARWrapper.dll'/ with vuforia plugin and latest version of Unity ( currently 5.1.2f 64bits ) and also couldn't get my laptop camera to work.

Everything is fixed with the 32 bit release of Unity, even if my os is 64 bits (Windows 7).