I can't open ACSM file. Error message E_AUTH_BAD_DEVICE_KEY_OR_PKCS12. I can't erase the authorisation

I can't open ACSM file on a MAC.

Error message E_AUTH_BAD_DEVICE_KEY_OR_PKCS12.

I can't cancel the authorization.

How can I read my ebooks?

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Quit Adobe Digital Editions.
Navigate to /Users//Library/Application Support/Adobe/Digital Editions and drag the activation.dat file to the trash.
If you are using 10.7, see Access hidden library files | Mac OS 10.7 and later.
Open Adobe Digital Editions and reauthorize.

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