"We offer new support options and therefor the forums are now in read-only mode! Please check out our Support Center for more information." - Vuforia Engine Team

Vuforia Initialization Error

Hi all, 

actually we are developing an app for IOS using unity and vuforia and the app is also working fine.

But sometimes it shows an error as in the attachment like "Vuforia Initiaization Error",

"Invalid Key used. Please make sure you are using a valid Vuforia App Key" and then it would crashed.

Please guide me, how to solve this issue ASAP. 

Attachment