Try reinstalling Unity as there could be something wrong with your installation.

The sample apps (start with Image Targets) should run out of the box.  All you should need to do is:

• Run unity
• Create a new project
• Import the Vuforia image targets package
• Click on the Image Targets scene to make it current 
• Go to build settings and select iOS
• Click player settings 
• In the inspector under the iOS settings tab set your bundle identifier you got from Apple
• Build and run

The app should now be working on the device.

N

Thank you for the reply it was a unity problem i reinstalled it and it work thank you....

Great to hear it's working

N

Hello Friends. This is Sai. I am new to IOS platform. I am trying to build an IOS app using unity project files that I have previously used for Windows 10 and Android Build. The app is getting crashed immediately after launch and sometimes it is showing everything pink on GUI(Canvas, Text and Buttons). Couldnt find any solution for this. Can anyone help me out with this problem?

First: logs. Can you share some strings of it?

Second: "Pink" is quite too wide color range. Do you mean "magenta"?

If it's so you have problem with "renderer": probably shaders, probably materials. Try for shaders first (in this case you may find some info in logs).