PLS-00721: 'string' formed a non-REF mutually-dependent cycle with 'string'

Cause: This compilation was aborted because the library unit that was compiled would have formed a non-REF mutually-dependent cycle with some other library units. This happens when an attempt is made to compile types that have attributes of other types that may participate in a cycle with this type. 

create type t1; 

create type t2 (a t1); 

create type t1 (a t2);

Action: Break the cycle (possibly by adding a REF or by using another type).

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