Using ARReferenceImage with ARKit in iOS 11.3 beta 2 results in "error: Exception while running actool:"

Question

Repro:

• Xcode 9.3 beta
• iOS 11.3 beta 2
• Add ARReferenceImages to Assets.xcassets following documentation here
• Compile

Results in: error: Exception while running actool: ...

Answer 1

Looks like a bug in Xcode where the deployment target also has to be 11.3 to use ARReferenceImages with asset catalogs.

Fix: Change deployment target to 11.3

Answer 2

Adding a Named color (New color set) to the asset catalog will workaround this error.