I have bought the classic license key. And I use vuforia5.0.5 sdk with unity 5.0.3. I build my own project according to the VideoPlayback sample. The way I use vuforia is almost the same as VideoPlayback sample do. The difference is I dynamically load dataset in my script, but my problem is nothing with the dynamic load.
But accidentally when loading the AR scene, the error occurred：
"Invalid Key used. Please make sure you are using a valid Vuforia App Key
QCAR initialization failed
Vuforia initialization failed"
My license key is valid.As the picture show,I just add my key to the License Key field on the VuforiaBehaviour component in the ARCamera's Inspector panel. The AR scene is work fine.The invalid key error just turn out very occasionally.
Does anyone know the reason?