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If TFS is installed, when the Resource.Designer.cs file is modified in the build process, the build fails if the file is not explicitly checked out. It would be better if this file was automatically checked out in the same way a file is if you edit it from VS.
The error given is:
Error 1 The "CopyIfChanged" task failed unexpectedly.
System.UnauthorizedAccessException: Access to the path 'Resources\Resource.Designer.cs' is denied.
at System.IO.__Error.WinIOError(Int32 errorCode, String maybeFullPath)
at System.IO.File.InternalCopy(String sourceFileName, String destFileName, Boolean overwrite)
at System.IO.File.Copy(String sourceFileName, String destFileName, Boolean overwrite)
at Microsoft.Build.BackEnd.TaskBuilder.ExecuteInstantiatedTask(ITaskExecutionHost taskExecutionHost, TaskLoggingContext taskLoggingContext, TaskHost taskHost, ItemBucket bucket, TaskExecutionMode howToExecuteTask, Boolean& taskResult) WebMD.Mobile.JustOneThing
*** This bug has been marked as a duplicate of bug 5870 ***