OCI-54414
The "defaultOnNull.string" field in the JSON metadata does not correspond to an input attribute name.
Cause
The JSON object value for the "defaultOnNull" field in the JSON metadata contains a field name that is not an input attribute name.
Action
Ensure that the JSON object value given to the "defaultOnNull" field of the JSON metadata only contains fields with the name that matches the input attribute name. Input attribute names are, by default, the names of the input of the Open Neural Network Exchange (ONNX) model, but this can be overriden by specifying the "input" field in the JSON metadata.