Cause: The SDO_ETYPE column in the <layer>_SDOGEOM table contains an invalid geometric element type value. See the solution below.
Error solution: Redefine the geometric element type in the <layer>_SDOGEOM table for the specified geometric element using one of the supported SDO_ETYPE values. See the Oracle Spatial documentation for an explanation of SDO_ETYPE and its possible values.
Database version: Oracle 11g Release 2 (11.2)