I got this error out of the blue..help

[Doug Handler]

Error 1 The "GenerateApplicationManifest" task failed unexpectedly.
System.IO.PathTooLongException: The specified path, file name, or both are
too long. The fully qualified file name must be less than 260 characters,
and the directory name must be less than 248 characters.
at System.IO.Path.NormalizePathFast(String path, Boolean fullCheck)
at System.IO.Path.GetFullPathInternal(String path)
at System.IO.Path.GetFullPath(String path)
at
Microsoft.Build.Tasks.Deployment.ManifestUtilities .Manifest.ResolvePath(String
path, String[] searchPaths)
at
Microsoft.Build.Tasks.Deployment.ManifestUtilities .Manifest.ResolveAssembly(AssemblyReference
a, String[] searchPaths)
at
Microsoft.Build.Tasks.Deployment.ManifestUtilities .Manifest.ResolveFiles_1(String[]
searchPaths)
at Microsoft.Build.Tasks.GenerateManifestBase.Resolve Files()
at Microsoft.Build.Tasks.GenerateManifestBase.BuildMa nifest()
at Microsoft.Build.Tasks.GenerateManifestBase.Execute ()
at Microsoft.Build.BuildEngine.TaskEngine.ExecuteTask (ExecutionMode
howToExecuteTask, Hashtable projectItemsAvailableToTask, BuildPropertyGroup
projectPropertiesAvailableToTask, Boolean& taskClassWasFound) MyFileName