Oracle Error Message
ORA-40306: dm_nested types not supported by this algorithm
Reason for the Error
The training input to the CREATE_MODEL routine contains one or more columns of dm_nested type (DM_NESTED_NUMERICALS and/or DM_NESTED_CATEGORICALS). These columns are currently not supported for Decision Tree, O-Cluster, and Adaptive Bayes Network algorithms.
Solution
Remove columns of these data types from the input data source.