SSRS report missing assembly reference

Hi Dax community,

I am doing my first report with business logic based on “InventOnHandReport”, i am trying to duplicate the report.

I duplicated SSRS, VS solution and c # business logic method, but when i deploy c# method, I have an error wich tell me that i have a missing assembly reference “”.

Is anyone knows where i can find this reference?, i tried to add it in AOT references and also in Visual Studio but never find it.

Thanks in advance