How can I drop an undefined object

Question

I'm struggling on creating synonyms for some package (that compiled successfully). Java application display this error:

identifier 'blackPackage' must be declared

When I try create public synonym blackPackage for purpleUser.blackPackage I got this error:

ORA-38818
Description: illegal reference to editioned object purpleUser.blackPackage

Then I tried all_objects, I got this:

1. When I run create public synonym blackPackage for purpleUser.blackPackage, how can I say if it's pointing to object type procedure ou undefined?

2. How can I drop this undefined object?

3. Using this, I discovered purpleUser has 'N' on it. Should be 'Y' to allow creating synonyms?