[FABRIC:MT] Failed to persist port 'drawThis' (DrawingHandle), objects must inherit from RTValToJSON

Hello Guys, I am trying to make a preset that is similar to DrawAxe preset, upon exporting the graph node, I get this error:

[FABRIC:MT] Failed to persist port 'drawThis' (DrawingHandle), objects must inherit from RTValToJSONEncoder and RTValFromJSONDecoder to be persistable

I have looked at other similar system graph nodes, and somehow I cannot see any difference with my graph node.

Thoughts?

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