PlaygroundAsset has no default value

Message

[LunaPlaygroundAsset] Attribute added onto "FIELD NAME" field of "CLASS NAME" class must have a default value to appear in Unity Playworks.

Explanation

The sole purpose of a field with [LunaPlaygroundAsset] is to hint Unity Playworks that a specific asset should be modifiable via Unity Playworks UI. The field with this attribute does not have to be considered by game code in any way (although developers are free to do so if needed). Obviously, for the Unity Playworks to know which asset to modify the field has to point to some existing asset. Thus, a field marked with such an attribute and lacking an association to an asset will not function properly.

Steps to fix

Please assign an asset to the field via Unity's inspector window.