Why do I get "Error Unable to initialize the Unity Engine" in Android when I open the app I created on Unity?

I am trying to create an apk file on Unity, and run it on my Samsung Galaxy S7 edge (I tried other android phones as well). I was able to create an apk file and install it on my device, but when I open the app on the phone, the following comes up:

“Error Unable to initialize the Unity Engine”.

In case it is relevant, here are some info on things I did:

  1. I am using Vuforia for detecting an image target using an AR Camera…
  2. I tried different textures before I hit build and run.
  3. I tried the app with Unity Remote and it works, HOWEVER it still uses the laptop’s Web Cam and all other Web Cams connected to the computer, and refuses to use the phone’s camera. When I disable all cameras on the computer, it just gives a black screen.

Thanks in advance.

if you installed Android-Support-for-Editor for one version and tried it for another it will give that error.
for me I downloaded the installer for 5.4.1f1 and installed it for 5.4.1p3. it gave me this error when I ran the app after installing the APK on my tablet. when I installed the same installer for 5.4.1f1 the build worked just fine.

Same… This happens after I updated my Unity5 to v5.4.0f3

FIXED:
I installed the latest version 5.4.1f1, it fixed the build.