Not Able to use ML Extractor

Error Could not load file Main.xaml. Reason: The invocation of the constructor on type ‘UiPath.DocumentUnderstanding.ML.Activities.MachineLearningExtractor’ that matches the specified binding constraints threw an exception.

what is the possible solution for this. i am not able to use ML extractor with AI center, With Public End point it work fine

Can I get more details? Whats the ML model you are using and if you are using a custom ML model have you made the ML skill public?