PLS-907 cannot load library unit

One of our database appeared this error after compiling some package and this package remain invalid state.

PLS-00907 : cannot load library unit schema.package

Cause:
PL/SQL is unable to find and load a library unit that was previously available. This typically happens when you try to load a unit which references another library unit that is non-existent or invalid.
Solution:

alter system flush shared_pool;

after that package compilation run successfully.

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