Unable to generate a temporary class

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Unable to generate a temporary class (result=1).
error CS0012: The
type 'EPiServer.Security.SecurityEntityType' is defined in an assembly that is
not referenced. You must add a reference to assembly 'EPiServer,
Version=6.0.530.0, Culture=neutral, PublicKeyToken=8fe83dea738b45b7'.
error
CS0030: Cannot convert type 'EPiServer.Security.SecurityEntityType []' to
'EPiServer.Security.SecurityEntityType
[c:\Windows\assembly\GAC_MSIL\EPiServer.Framework\6.2.267.1__8fe83dea738b45b7\EPiServer.Framework.dll]'
error
CS0029: Cannot implicitly convert type 'EPiServer.Security.SecurityEntityType
[c:\Windows\assembly\GAC_MSIL\EPiServer.Framework\6.2.267.1__8fe83dea738b45b7\EPiServer.Framework.dll]'
to 'EPiServer.Security.SecurityEntityType []'

Description:
An unhandled exception occurred during the execution of the current web
request. Please review the stack trace for more information about the error and
where it originated in the code.

Exception Details:
System.InvalidOperationException: Unable to generate a temporary class
(result=1).
error CS0012: The type 'EPiServer.Security.SecurityEntityType' is
defined in an assembly that is not referenced. You must add a reference to
assembly 'EPiServer, Version=6.0.530.0, Culture=neutral,
PublicKeyToken=8fe83dea738b45b7'.
error CS0030: Cannot convert type
'EPiServer.Security.SecurityEntityType []' to
'EPiServer.Security.SecurityEntityType
[c:\Windows\assembly\GAC_MSIL\EPiServer.Framework\6.2.267.1__8fe83dea738b45b7\EPiServer.Framework.dll]'
error
CS0029: Cannot implicitly convert type 'EPiServer.Security.SecurityEntityType
[c:\Windows\assembly\GAC_MSIL\EPiServer.Framework\6.2.267.1__8fe83dea738b45b7\EPiServer.Framework.dll]'
to 'EPiServer.Security.SecurityEntityType []'

Source Error:

The source code that generated this unhandled exception can only be 
shown when compiled in debug mode. To enable this, please follow one of the 
below steps, then request the URL:

1. Add a "Debug=true" directive at the 
top of the file that generated the error. Example:

  <%@ Page 
Language="C#" Debug="true" %>

or:

2) Add the following section 
to the configuration file of your 
application:

<configuration>
   <system.web>
       <compilation 
debug="true"/>
   </system.web>
</configuration>

Note 
that this second technique will cause all files within a given application to be 
compiled in debug mode. The first technique will cause only that particular file 
to be compiled in debug mode.

Important: Running applications in debug 
mode does incur a memory/performance overhead. You should make sure that an 
application has debugging disabled before deploying into production 
scenario.

Stack Trace:

[InvalidOperationException: Unable to generate a temporary class (result=1).
error CS0012: The type 'EPiServer.Security.SecurityEntityType' is defined in an assembly that is not referenced. You must add a reference to assembly 'EPiServer, Version=6.0.530.0, Culture=neutral, PublicKeyToken=8fe83dea738b45b7'.
error CS0030: Cannot convert type 'EPiServer.Security.SecurityEntityType []' to 'EPiServer.Security.SecurityEntityType [c:\Windows\assembly\GAC_MSIL\EPiServer.Framework\6.2.267.1__8fe83dea738b45b7\EPiServer.Framework.dll]'
error CS0029: Cannot implicitly convert type 'EPiServer.Security.SecurityEntityType [c:\Windows\assembly\GAC_MSIL\EPiServer.Framework\6.2.267.1__8fe83dea738b45b7\EPiServer.Framework.dll]' to 'EPiServer.Security.SecurityEntityType []'
]
   System.Xml.Serialization.Compiler.Compile(Assembly parent, String ns, XmlSerializerCompilerParameters xmlParameters, Evidence evidence) +1267
   System.Xml.Serialization.TempAssembly.GenerateAssembly(XmlMapping[] xmlMappings, Type[] types, String defaultNamespace, Evidence evidence, XmlSerializerCompilerParameters parameters, Assembly assembly, Hashtable assemblies) +2890
   System.Xml.Serialization.TempAssembly..ctor(XmlMapping[] xmlMappings, Type[] types, String defaultNamespace, String location, Evidence evidence) +125
   System.Xml.Serialization.XmlSerializer.GenerateTempAssembly(XmlMapping xmlMapping, Type type, String defaultNamespace) +144
   System.Xml.Serialization.XmlSerializer..ctor(Type type, String defaultNamespace) +545
   Dropit.Extension.Core.Serializer.Deserialize(String xml) +221
   Dropit.Extension.Controllers.PageDataManager.LoadSpecializedCommonData(PageReference rootLink) +164
   Dropit.Extension.Common.CategoryStorage.Load() +50
   Dropit.Extension.Controllers.CategoryManager.get_ExtensionCategories() +50
   Dropit.Extension.Controllers.CategoryManager.Initialize() +56
   Dropit.Extension.Common.GlobalSettings.InitializeSettings() +73
   Dropit.Extension.Handlers.InitializationModule.Initialize(InitializationEngine context) +32
   EPiServer.Framework.Initialization.InitializationEngine.InitializeModules() +859
   EPiServer.Framework.Initialization.InitializationEngine.Initialize(HostType hostType) +115
   EPiServer.Framework.Initialization.InitializationModule.Initialize(HostType hostType) +227
   EPiServer.Framework.Initialization.InitializationModule.FrameworkInitialization(HostType hostType) +56
   EPiServer.Global..ctor() +76
   ASP.global_asax..ctor() +9

[TargetInvocationException: Exception has been thrown by the target of an invocation.]
   System.RuntimeTypeHandle.CreateInstance(RuntimeType type, Boolean publicOnly, Boolean noCheck, Boolean& canBeCached, RuntimeMethodHandle& ctor, Boolean& bNeedSecurityCheck) +0
   System.RuntimeType.CreateInstanceSlow(Boolean publicOnly, Boolean fillCache) +146
   System.RuntimeType.CreateInstanceImpl(Boolean publicOnly, Boolean skipVisibilityChecks, Boolean fillCache) +298
   System.Activator.CreateInstance(Type type, Boolean nonPublic) +79
   System.RuntimeType.CreateInstanceImpl(BindingFlags bindingAttr, Binder binder, Object[] args, CultureInfo culture, Object[] activationAttributes) +10362891
   System.Web.HttpApplicationFactory.GetSpecialApplicationInstance(IntPtr appContext, HttpContext context) +258
   System.Web.Hosting.PipelineRuntime.InitializeApplication(IntPtr appContext) +382

[HttpException (0x80004005): Exception has been thrown by the target of an invocation.]
   System.Web.HttpRuntime.FirstRequestInit(HttpContext context) +11305670
   System.Web.HttpRuntime.EnsureFirstRequestInit(HttpContext context) +88
   System.Web.HttpRuntime.ProcessRequestNotificationPrivate(IIS7WorkerRequest wr, HttpContext context) +4342340

I think its strange that it says i need to reference to a old dll file since i upgraded it. I got the correct dll files from the upgrade in my solution to...

Unable to generate a temporary class

Server Error in '/' Application.