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Vuforia failed to initialize...

So this seems to be a common error with more than one cause http://stackoverflow.com/questions/37950316/vuforia-failed-to-initialize-on-android-l https://developer.vuforia.com/forum/qcar-api/failed-initialize-vuforia My application runs fine in the editor But after deploying to device my application launches but with the Vuforia popup error. Am targeting Android on a Samsung TAB S2. Latest Unity Pro 5.5.1, OpenGLES2.0. Can anyone suggest next troubleshooting steps?

addendum.

Definitely NOT my device since Vuforia Sample apps deploy and run without issue.

I also get the exact same error when deploying from Unity Windows or Unity Mac 5.5.1.

 

Possibly some Project or Player Setting? or conflict with another asset?