PLS-00900: can't find body of unit 'string'

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PLS-00900: can't find body of unit 'string'..

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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;

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