@aglamazy,
You might have an issue – or not.
If you inactivate and then reactivate the plug-in then you will see whether there is an actual problem or not.
If, on the second activation, you do not get this message, then there is no problem for you.
A fix has been made, but not yet released, for this scenario.
If you do get the message, then it is because the user who is activating the package (normally Administratoe) would expect to see under the Documents menu the options Document List and Add Document. However the user needs to have edit_documents capability to see this.
Since the plug-in gives Administrator edit_documents capability, you might ask why this process exists.
It is because the activation process assigns document capabilities to ALL roles – with the default being not to have this capability. Therefore if the Administrator has another role, then it is probable that the user does not have the edit_documents capability. And this may cause some confusion.
Hope this clarifies,
Neil James