Hi,I did a Image target project .At first It detected the image a showed the AR model.After one day it is not showing anything why?.In the console it was showing this message.If you want to enable ARCore support for Vuforia, please follow the steps outlined in the library article below. https://library.vuforia.com/content/vuforia-library/en/articles/Solution/arcore-with-vuforia.html.So I did the steps said in the site.I created a Android folder in the Assets/Plugins path an copied the plugin into the Android folder.When I toook build still the message was showing.In player settings I have activated the Vuforia Augmented reality checkbox.I have added the key in App License Key.
Tracking mode -Positional
Fusion Mode-Optimize for Image Targets and VuMarks
Vuforia SDK Version: 7.2.24
Unity Editor Version: 2018.1.0f2