The error "Could not create a validated object, cause: ValidateObject failed " occurs when the Ping Query executed in the data source is not valid. I would recommend you to check the ping query that you used in the connection pool configuration of the data source for testing the connection.
You can also have a look at the below community question that might be useful:
1. [Error querying Oracle DB.](https://community.denodo.com/answers/question/details?questionId=90670000000blYdAAI&title=Error+querying+Oracle+DB)
To know more about how it works, please check the section "Importing JDBC Sources" of Virtual DataPort Administration Guide.
Hope this helps!!