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If you get this error message while converting or opening an EPUB or PDF file, that means it was successfully converted from ACSM to EPUB/PDF, but the resulting EPUB/PDF file still contains DRM.

This plugin (ACSM Input) is just responsible for "converting" an ACSM file to EPUB or PDF. It doesn't do any DRM removal at all, that can be done with the DeDRM plugin.

Either you don't have the DeDRM plugin installed, or it is not set up correctly. If you're running DeDRM older than v10.0.2, you might have to manually export the account key from the ACSM Input plugin (click the "Export account encryption key" button in the settings) and then import it into the DeDRM plugin (Settings -> ADE ebooks -> Import existing keyfiles)

If that still doesn't help, you'll need to get support whereever you got the DeDRM plugin from, Mobileread doesn't allow giving detailed support / instructions for DRM removal.