Worker process error on SP receive

When receiving an SSO on the SP side it’s timing out and the following error is generated

w3wp.exe Information: 0 : DotNetOpenAuth.Core, Version=4.0.0.0, Culture=neutral, PublicKeyToken=2780ccd10d57b246 (official)
w3wp.exe Information: 0 : Reporting will use isolated storage with scope: User, Domain, Assembly
w3wp.exe Error: 0 : Error while trying to initialize reporting.: System.IO.IOException: The process cannot access the file ‘requests.txt’ because it is being used by another process.
at System.IO.__Error.WinIOError(Int32 errorCode, String maybeFullPath)
at System.IO.FileStream.Init(String path, FileMode mode, FileAccess access, Int32 rights, Boolean useRights, FileShare share, Int32 bufferSize, FileOptions options, SECURITY_ATTRIBUTES secAttrs, String msgPath, Boolean bFromProxy, Boolean useLongPath)
at System.IO.FileStream…ctor(String path, FileMode mode, FileAccess access, FileShare share, Int32 bufferSize, FileOptions options, String msgPath, Boolean bFromProxy, Boolean useLongPath)
at System.IO.IsolatedStorage.IsolatedStorageFileStream…ctor(String path, FileMode mode, FileAccess access, FileShare share, Int32 bufferSize, IsolatedStorageFile isf)
at System.IO.IsolatedStorage.IsolatedStorageFileStream…ctor(String path, FileMode mode, FileAccess access, FileShare share, IsolatedStorageFile isf)
at DotNetOpenAuth.Reporting.PersistentHashSet…ctor(IsolatedStorageFile storage, String fileName, Int32 maximumElements)
at DotNetOpenAuth.Reporting.Initialize()


Has anyone encountered this before? Fairly new to SAML so please be gentle…

This doesn’t appear to be a SAML issue. Instead it looks like a permissions problem with DotNetOpenAuth.
System.IO.IOException: The process cannot access the file ‘requests.txt’