1. Change the value of config_error_display to "0" in ocart.sql
2. Have disabled upgrade in 2.1.0.1 due to Errors in 2.0.3.1 to 2.1.0.1 upgarde and few tables are not generating after upgrade. ( same issue for 2.1.0.2, In next release plz check upgrade from 2.0.3.1 and check DB changes. ). Have mailed vendor.
3. Try to add upgrade from 2.2.0.0 to 2.3.X.X. We have disabled it in 2.3.0.2 because front link is not loading due to change in extention path. http://forum.opencart.com/viewtopic.php?f=183&t=165958