Could not Load file or assembly 'projectname'

Could not Load file or assembly 'projectname'

So basically, I was working on my C# asp.net project in Visual Studio 2012
Express for web when all of a sudden I was give a very strange warning by
visual studio. I get this warning whenever I try to build or debug the
project. Maybe I accidentally clicked on something I shouldn't have, I
don't know.
This is the warning.
"Z:\AAIA_NewCatalog\AdminSite\AdminSite\Catalogdata\Update.aspx: ASP.NET
runtime error: Could not load file or assembly 'AdminSite' or one of its
dependencies. Access is denied.
Z:\AAIA_NewCatalog\AdminSite\AdminSite\Catalogdata\Update.aspx"
AdminSite is the name of the project and the solution
And here is the error
Error 1 Unable to copy file "obj\Debug\AdminSite.dll" to
"bin\AdminSite.dll". Access to the path 'bin\AdminSite.dll' is denied.
AdminSite
I am certainly willing to post any code, I am just not sure what to post,
perhaps stuff from my Web.config.
From my perspective it could be a permissions issue, but if you have seen
this before please respond with help.