Oracle Solution for Error ora-39120

Solution for Oracle Error ORA-39120

ORA-39120: Table string can't be truncated, data will be skipped. Failing error is: string

What triggered the Error:

Table data was about to be loaded into a table that already existed and the table_exists_action parameter is truncate, but the table could not be truncated.

What should we do to fix it:

Determine actual cause by looking at base error.