當我們想要安裝DotNetNuke的時候 總是會碰到下列問題
（以下是在Windows 7 IIS7.5 工作環境下常見問題）
Description: The application attempted to perform an operation not allowed by the security policy. To grant this application the required permission please contact your system administrator or change the application's trust level in the configuration file.
Exception Details: System.Security.SecurityException: Request for the permission of type 'System.Security.Permissions.FileIOPermission, mscorlib, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089' failed.
Source Error:
[No relevant source lines]
Source File: FileBasedCachingProvider.vb Line: 280
Stack Trace:
[SecurityException: Request for the permission of type 'System.Security.Permissions.FileIOPermission, mscorlib, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089' failed.]
System.Security.CodeAccessSecurityEngine.Check(Object demand, StackCrawlMark& stackMark, Boolean isPermSet) +0
System.Security.CodeAccessPermission.Demand() +59
System.IO.Path.GetFullPath(String path) +98
DotNetNuke.Services.Cache.FileBasedCachingProvider.FBCachingProvider.GetFileName(String FileName) in FileBasedCachingProvider.vb:280
DotNetNuke.Services.Cache.FileBasedCachingProvider.FBCachingProvider.Insert(String CacheKey, Object objObject, Boolean PersistAppRestart) in FileBasedCachingProvider.vb:116
DotNetNuke.Common.Utilities.DataCache.SetCache(String CacheKey, Object objObject, Boolean PersistAppRestart) in DataCache.vb:217
DotNetNuke.Common.Utilities.DataCache.SetCache(String CacheKey, Object objObject) in DataCache.vb:213
DotNetNuke.Entities.Host.HostSettings.GetHostSettings() in HostSettings.vb:62
DotNetNuke.Common.Globals.get_HostSettings() in Globals.vb:233
DotNetNuke.Common.Globals.GetHostPortalSettings() in Globals.vb:725
DotNetNuke.Common.Globals.GetPortalSettings() in Globals.vb:779
DotNetNuke.Authentication.ActiveDirectory.HttpModules.AuthenticationModule.Init(HttpApplication application) +198
System.Web.HttpApplication.InitModulesCommon() +66
System.Web.HttpApplication.InitInternal(HttpContext context, HttpApplicationState state, MethodInfo[] handlers) +1006
System.Web.HttpApplicationFactory.GetNormalApplicationInstance(HttpContext context) +259
System.Web.HttpApplicationFactory.GetApplicationInstance(HttpContext context) +114
System.Web.HttpRuntime.ProcessRequestInternal(HttpWorkerRequest wr) +350
