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Completed
5.4p2 get_skinIndex is not allowed be called from a ScriptableObject constructor
get_skinIndex is not allowed to be called from a ScriptableObject constructor (or instance field initializer), call it in OnEnable instead. Called from ScriptableObject 'SFN_Append'.
i've been seeing a lot of these errors in all kinds of extensions since 5.4, not just shaderforge.
Answer
Customer support service by UserEcho
This has now been fixed in 1.28