Please help me resolve the error

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Visual-Studio

created an asp.net web application project(named:mvc6)and added a classlibraray project from windows classic desktop(name:Businesslayer) ,when i was trying to add a controller from mvc6 after adding the reference of business layer in it ,there was a pop up displaying an error :could not load file or assembly 'Businesslayer.dll' .the system cannot find the file specified

What I have tried:

i've unchecked the Businesslayer reference from mvc6 ,manually added the reference '@using Businesslayer'in the newly added controller and checked the reference box again ,it works but the view for it wasn't automatically generated ,Am i using the wrong class library ?

i'm using visual studio professional ,version:15.5.6 and .net framework of 4.7.02558 btw