Error when clicking Manage after upgrade to 6.4.1

I have Upgraded my Dnn Web Portal From 7 to 9. After Upgrade DNN Blog is Not Working Properly
After I Installing this Module the Edit button is working fine . when i click on Manage button i found the Error.
rror: is currently unavailable. DotNetNuke.Services.Exceptions.ModuleLoadException: E:\Lalit Work\wwwroot\DesktopModules\Blog\Manage.ascx(23): error BC30512: Option Strict On disallows implicit conversions from 'Object' to 'String'. ---|> System.Web.HttpCompileException: E:\Lalit Work\wwwroot\DesktopModules\Blog\Manage.ascx(23): error BC30512: Option Strict On disallows implicit conversions from 'Object' to 'String'. at System.Web.Compilation.BuildManager.CompileWebFile(VirtualPath virtualPath) at System.