See the Exhibit:

DATA_FILES is a directory object that contains the DETAILS.txt text file. You have the required permissions to access the directory object. You have a table using the following command:
CREATE TABLE clob_tab(col2,CLOB);
Examine the PL/SQL statement in exhibit that you execute for loading the external text file into the table that currently has no rows. The PL/SQL block results in an error. What correction must be done to ensure the PL/SQL block executes successfully?