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Could you please confirm the application you are working on? I believe you are referring to Adobe Digital Edition?
If yes, then the error E_ACT_TOO_MANY_ACTIVATIONS is displayed, indicating that all the authorizations allowed for Adobe Digital Editions on that machine have been used.
You can try the suggestion given here: E_ACT_TOO_MANY_ACTIVATIONS error in Adobe Digital Editions
Moving query to Adobe Digital Editions