Cause: A subprogram specification was
declared, but the corresponding subprogram body was not defined. Write the
subprogram specification and body as a unit. An alternative solution is to
separate the specification from its body, which is necessary when you want to
define mutually recursive subprograms or you want to group subprograms in a
package.
Action: Check the spelling of the
subprogram name. If necessary, supply the missing subprogram
body.

Relared Errors:
PLS-00329:
schema-level type has illegal reference to string
PLS-00330:
invalid use of type name or subtype name
PLS-00331:
illegal reference to string
PLS-00332:
string is not a valid prefix for a qualified name
PLS-00333:
string must match an object-table alias in this
context
PLS-00334:
string matches table or view without an alias
PLS-00335: a
package name conflicts with an existing object
PLS-00336:
non-object-table string illegal in this context
PLS-00337:
string matches too many object table aliases
PLS-00338:
unable to resolve string as a column or row
expression