Oracle Message ORA-13026 - unknown element type for element string.string.string

ERROR	unknown element type for element string.string.string
CAUSE	The SDO_ETYPE column in the _SDOGEOM table contains an invalid geometric element type value.
ACTION	Redefine the geometric element type in the _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.