E_ADEPT_DOCUMENT_TYPE_UNKNOWN error message

I keep getting the following error message:

I'm trying to download Christmas ever after 9781474030946 to ADE 4.0 and then the app just crashes after I OK out of the error message.

Can someone help please?

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Which format has the eBook?

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Adobe Content Server Message (.acsm)

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Which operating system do you use? Which Version of Digital Edition you used?

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