I followed the steps to create an external table. However, when I try to select count(*) from the table I get the following error:
ERROR at line 1:
ORA-29913: error in executing ODCIEXTTABLEOPEN callout
ORA-29400: data cartridge error
KUP-04043: table column not found in external source: ABSTRACT
ORA-06512: at "SYS.ORACLE_LOADER", line 19
How do I fix this?