I'm following this tutorial https://library.vuforia.com/content/vuforia-library/en/articles/Solution/how-to-create-and-load-targets-in-unity.html

It shows you how to create Instant Image Targets at Runtime. I've followed every step, but seem to be getting the following error:

error CS1061: 'ObjectTracker' does not contain a definition for 'RuntimeImageSource' and no accessible extension method 'RuntimeImageSource' accepting a first argument of type 'ObjectTracker' could be found

I've checked to see if the other methods in the 'ObjectTracker' class used work, and they do.. it just seems to complain about 'RuntimeImageSource', which is present in the docs for 'ObjectTracker'.

Unless the docs are out of date.