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[vj.jain]

ORA-01400 cannot insert NULL into (string)

Cause: An attempt was made to insert a NULL into the column
"USER"."TABLE"."COLUMN".
For example, if you enter:
connect scott/tiger
create table a (a1 number not null);
insert into a values (null);
Oracle returns:
ORA-01400 cannot insert NULL into ("SCOTT"."A"."A1") : which means you
cannot insert NULL into "SCOTT"."A"."A1".

Action: Retry the operation with a value other than NULL.