Hi Krishna
In MapInfo Pro 16.0 we only support the GeoCode API for geocoding, not the GeoZone API that does drive time polygons.
If you want to test the GeoZone API for creating drive time polygons, you need to sign up for the MapInfo Pro v17 beta and use this. This will include at the moment 2000 credits per months that can be used for drive time polygons or geocoding.
You can find MapInfo Pro 17.0 Beta in the MapInfo Pro v17 Beta group: https://li360.pitneybowes.com/s/group/CollaborationGroup/00B80000008HQlvEAG