err-codes.com

Cause: At run time, the body of a
program unit could not be found. This can happen for one of two reasons. —
First, there may be a unit `a` which calls a module `b`, where the spec for
`b` exists but not the body. In this case, since the spec is present, there
will be no compile-time errors. — Secondly, this can occur if there is a
reference to a sequence outside of the proper context such as a SQL statement.
In this case, the spec of the sequence reference can be found, but it is
invalid to actually run code which references the sequence outside a SQL
statement, as in: i := seq.nextval;
Action: If caused by the first reason,
create a body for the object that is being referenced. If caused by the second
reason, move the sequence into a SQL statement. For example, i := seq.nextval;
can be replaced by: select seq.nextval into temp from dual; i :=
temp;