The problem is usually caused by a reference within the reference path to an older version of the assembly or DLL in the Windows Forms Control and ASP.NET Server Control products.

To solve this issue, place the new DLL assembly in the project directory (not the bin directory). Then, open the appropriate .user file (example: *.vbproj.user) with a text editor and remove the path from the ReferencePath:

<VisualStudioProject>
    <VisualBasic>
        <Build>
            <Settings ReferencePath 
= "" >
                
<Config ...