ORA-54414
The "defaultOnNull.string" field in the JSON metadata does not exist as an input attribute.
Cause
The "defaultOnNull" field in the JSON metadata contains a value that does not exist as an input attribute.
Action
Ensure that the JSON metadata "defaultOnNull" field only contains valid model attributes names. Model attribute names are by default the names of the input tensor of the Open Neural Network Exchange (ONNX) model, but this can be overriden by specifying the "input" field in the JSON metadata.