While using Unity 2019.2 it was a warning
Assets/AdventureCreator/Scripts/Actions/ActionMovieController.cs(47,11): warning CS0618: 'GUITexture' is obsolete: 'This component is part of the legacy UI system and will be removed in a future release.
In 2019.3 it becomes compiler error.
https://monosnap.com/file/msR9ETqRvngPKBVg2hdxYnDFyYCMeN
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Comments
ActionMovieController is not included in the AC package - is it a custom Action?
The script is pretty old, so it could be custom. Thank you for confirming that it's not an AC.