Meassage "error check activation"

ADE V4.5.12.112

display my Kobo =ye

display my books in the Kobo =yes

>Upside ADE : File

>select :ad a new book

>ad the name of file 

>select :Adobe content server

>acsm file display Too

>click on the file

>so is displaying “Error chack Activation”

That is an “error registry” Windows

the solution is :reed this link !

https://helpx.adobe.com/fr/digital-editions/kb/activation-errors-adobe-digital-editions.html?x-product=Helpx%2F1.0.0&x-product-location=Search%3AForums%3Alink%2F3.8.2

Tanks for reed